postgres backend (#48)

2025-09-26 20:11:14 +08:00 · 2025-07-13 13:05:18 +05:00
parent 7c532df931
commit 2178c81fca
179 changed files with 8084 additions and 7408 deletions
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,6 +13,20 @@ on:
 jobs:
    build:
        runs-on: ubuntu-latest
+        services:
+            postgres:
+                image: postgres:17-alpine
+                env:
+                    POSTGRES_USER: redka
+                    POSTGRES_PASSWORD: redka
+                    POSTGRES_DB: redka
+                options: >-
+                    --health-cmd "pg_isready --username=redka --dbname=redka --quiet"
+                    --health-interval 10s
+                    --health-timeout 5s
+                    --health-retries 5
+                ports:
+                    - 5432:5432
        steps:
            - name: Checkout
              uses: actions/checkout@v4
@@ -20,7 +34,7 @@ jobs:
            - name: Setup Go
              uses: actions/setup-go@v5
              with:
-                  go-version: "stable"
+                  go-version-file: "go.mod"

            - name: Install dependencies
              run: |
@@ -28,8 +42,15 @@ jobs:
                  sudo apt-get install -y libsqlite3-dev
                  go get .

-            - name: Test and build
-              run: make test build
+            - name: Install linter
+              uses: golangci/golangci-lint-action@v8
+
+            - name: Build and test
+              run: |
+                  make build
+                  make vet lint
+                  make test-sqlite
+                  make test-postgres

            - name: Upload artifact
              uses: actions/upload-artifact@v4
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -3,7 +3,7 @@ name: docker
 on:
    push:
        tags:
-            - "*"
+            - "v*.*.*"
    workflow_dispatch:

 jobs:
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -3,7 +3,7 @@ name: publish
 on:
    push:
        tags:
-            - "*"
+            - "v*.*.*"
    workflow_dispatch:

 permissions:
@@ -33,7 +33,7 @@ jobs:
            - name: Set up Go
              uses: actions/setup-go@v5
              with:
-                  go-version: "stable"
+                  go-version-file: "go.mod"

            - name: Build binary
              run: GOOS=${{ matrix.goos }} make build
@@ -85,3 +85,4 @@ jobs:
                  file: release/*
                  file_glob: true
                  tag: ${{ github.ref }}
+                  draft: true
--- a/49
+++ b/49
@@ -1,4 +1,4 @@
-.PHONY: setup lint vet test build run
+.PHONY: build

 has_git := $(shell command -v git 2>/dev/null)

@@ -20,21 +20,60 @@ build_date := $(shell date -u '+%Y-%m-%dT%H:%M:%S')
 setup:
 	@go mod download

-lint:
-	@golangci-lint run --print-issued-lines=false --out-format=colored-line-number ./...
-
 vet:
+	@echo "> running vet..."
 	@go vet ./...
+	@echo "✓ finished vet"
+
+lint:
+	@echo "> running lint..."
+	@golangci-lint run ./...
+	@echo "✓ finished lint"

 test:
-	@go test ./... -v
+	@echo "> running tests with $(driver) driver..."
+	@go test -tags=$(driver) ./...
+	@echo "✓ finished tests"

+test-sqlite:
+	@echo "> running tests with sqlite driver..."
+	@go test -tags=sqlite3 ./...
+	@echo "✓ finished tests"
+
+test-postgres:
+	@echo "> running tests with postgres driver..."
+	@go test -tags=postgres -p=1 ./...
+	@echo "✓ finished tests"

 build:
+	@echo "> running build..."
 	@CGO_ENABLED=1 go build -ldflags "-s -w -X main.version=$(build_ver) -X main.commit=$(build_rev) -X main.date=$(build_date)" -trimpath -o build/redka -v cmd/redka/main.go
+	@echo "✓ finished build"

 build-cli:
 	@CGO_ENABLED=1 go build -ldflags "-s -w" -trimpath -o build/redka-cli -v cmd/cli/main.go

 run:
 	@./build/redka
+
+postgres-start:
+	@echo "> starting postgres..."
+	@docker run --rm --detach --name=redka-postgres \
+		--env=POSTGRES_DB=redka \
+		--env=POSTGRES_USER=redka \
+		--env=POSTGRES_PASSWORD=redka \
+		--publish=5432:5432 \
+		--tmpfs /var/lib/postgresql/data \
+		postgres:17-alpine
+	@until docker exec redka-postgres \
+		pg_isready --username=redka --dbname=redka --quiet --quiet; \
+		do sleep 1; done
+	@echo "✓ started postgres"
+
+postgres-stop:
+	@echo "> stopping postgres..."
+	@docker stop redka-postgres
+	@echo "✓ stopped postgres"
+
+postgres-shell:
+	@docker exec -it redka-postgres psql --username=redka --dbname=redka
--- a/README.md
+++ b/README.md
@@ -1,17 +1,28 @@
 <img alt="Redka" src="logo.svg" height="80" align="center">

-Redka aims to reimplement the core parts of Redis with SQLite, while remaining compatible with Redis API.
+Redka aims to reimplement the core parts of Redis with SQL, while remaining compatible with Redis API.

 Notable features:

-   Data does not have to fit in RAM.
-   ACID transactions.
-   SQL views for better introspection and reporting.
-   Both in-process (Go API) and standalone (RESP) servers.
-   Redis-compatible commands and wire protocol.
+-   Data doesn't have to fit in RAM.
+-   Supports ACID transactions.
+-   SQL views for easier analysis and reporting.
+-   Works with both SQLite and PostgreSQL (coming v0.6.0) backends.
+-   Runs in-process (Go API) or as a standalone server.
+-   Redis-compatible commands and wire protocol (RESP).

 Redka is [functionally ready](docs/roadmap.md) for 1.0. Feel free to try it in non-critical production scenarios and provide feedback in the issues.

+## Use cases
+
+Here are some situations where Redka might be helpful:
+
+_Embedded cache for Go applications_. If your Go app already uses SQLite or just needs a simple, built-in key-value store, Redka is a natural fit. It gives you Redis-like features without the hassle of running a separate server. The cache persists across application restarts, and backup is as easy as copying a file.
+
+_Lightweight testing environment_. Your app uses Redis in production, but setting up a Redis server for local development or integration tests can be a hassle. Redka, when used with an in-memory SQLite database, gives you a fast alternative with complete isolation for each test run.
+
+_Postgres-first data structures_. If you prefer to use PostgreSQL for everything but need Redis-like data structures (like lists and sorted sets), Redka can use your existing database as the backend. This way, you can manage both relational data and specialized data structures with the same tools and transactional guarantees.
+
 ## Commands

 Redka supports five core Redis data types:
@@ -31,17 +42,21 @@ Redka comes in two flavors:
 -   Standalone Redis-compatible server: [installation](docs/install-standalone.md), [usage](docs/usage-standalone.md).
 -   Go module for in-process use: [installation](docs/install-module.md), [usage](docs/usage-module.md).

+## Storage
+
+Redka can use either SQLite or PostgreSQL as its backend. It stores data in a [SQL database](docs/persistence.md) with a simple schema and provides views for better introspection.
+
 ## Performance

-According to the [benchmarks](docs/performance.md), Redka is several times slower than Redis. Still, it can do up to 100K op/sec on a Macbook Air, which is pretty good if you ask me (and probably 10x more than most applications will ever need).
+Redka is not about raw performance. You can't beat a specialized data store like Redis with a general-purpose relational backend like SQLite. However, Redka can still handle tens of thousands of operations per second, which should be more than enough for many apps.

-Redka stores data in a [SQLite database](docs/persistence.md) with a simple schema and provides views for better introspection.
+See the [benchmarks](docs/performance.md) for more details.

 ## Contributing

 Contributions are welcome. For anything other than bugfixes, please first open an issue to discuss what you want to change.

-Be sure to add or update tests as appropriate.
+Make sure to add or update tests as needed.

 ## Acknowledgements

--- a/cmd/cli/main.go
+++ b/cmd/cli/main.go
@@ -17,7 +17,7 @@ const dbURI = "file:/data.db?vfs=memdb"

 func init() {
 	flag.Usage = func() {
-		fmt.Fprintf(flag.CommandLine.Output(), "Usage: redka-cli <filename>\n")
+		_, _ = fmt.Fprintf(flag.CommandLine.Output(), "Usage: redka-cli <filename>\n")
 		flag.PrintDefaults()
 	}
 }
--- a/cmd/redka/main.go
+++ b/cmd/redka/main.go
@@ -1,24 +1,29 @@
 // Redka server.
-// Example usage:
+//
+// Example usage (SQLite):
 //
 //	./redka -h localhost -p 6379 redka.db
 //
-// Example usage (client):
+// Example usage (PostgreSQL):
 //
-//	docker run --rm -it redis redis-cli -h host.docker.internal -p 6379
+//	./redka -h localhost -p 6379 "postgres://redka:redka@localhost:5432/redka?sslmode=disable"
 package main

 import (
+	"cmp"
 	"context"
 	"database/sql"
 	"flag"
 	"fmt"
 	"log/slog"
 	"net"
+	"net/url"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"

+	_ "github.com/lib/pq"
 	"github.com/mattn/go-sqlite3"
 	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/server"
@@ -31,9 +36,10 @@ var (
 	date    = "unknown"
 )

-const driverName = "redka"
-const memoryURI = "file:/data.db?vfs=memdb"
-const pragma = `
+const debugPort = 6060
+const sqliteDriverName = "sqlite-redka"
+const sqliteMemoryURI = "file:/redka.db?vfs=memdb"
+const sqlitePragma = `
 pragma journal_mode = wal;
 pragma synchronous = normal;
 pragma temp_store = memory;
@@ -53,100 +59,41 @@ func (c *Config) Addr() string {
 	return net.JoinHostPort(c.Host, c.Port)
 }

-var config Config
-
 func init() {
-	// Set up command line flags.
+	// Set up flag usage message.
 	flag.Usage = func() {
-		fmt.Fprintf(flag.CommandLine.Output(), "Usage: redka [options] <data-source>\n")
+		_, _ = fmt.Fprintf(flag.CommandLine.Output(), "Usage: redka [options] <data-source>\n")
 		flag.PrintDefaults()
 	}
-	flag.StringVar(&config.Host, "h", "localhost", "server host")
-	flag.StringVar(&config.Port, "p", "6379", "server port")
-	flag.StringVar(&config.Sock, "s", "", "server socket (overrides host and port)")
-	flag.BoolVar(&config.Verbose, "v", false, "verbose logging")

 	// Register an SQLite driver with custom pragmas.
 	// Ensures that the PRAGMA settings apply to
 	// all connections opened by the driver.
-	sql.Register(driverName, &sqlite3.SQLiteDriver{
+	sql.Register(sqliteDriverName, &sqlite3.SQLiteDriver{
 		ConnectHook: func(conn *sqlite3.SQLiteConn) error {
-			_, err := conn.Exec(pragma, nil)
+			_, err := conn.Exec(sqlitePragma, nil)
 			return err
 		},
 	})
 }

 func main() {
-	// Parse command line arguments.
-	flag.Parse()
-	if len(flag.Args()) > 1 {
-		flag.Usage()
-		os.Exit(1)
-	}
+	config := mustReadConfig()
+	logger := setupLogger(config)

-	// Set the data source.
-	if len(flag.Args()) == 0 {
-		config.Path = memoryURI
-	} else {
-		config.Path = flag.Arg(0)
-	}
+	slog.Info("starting redka", "version", version, "commit", commit, "built_at", date)

 	// Prepare a context to handle shutdown signals.
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer stop()

-	// Set up logging.
-	logLevel := new(slog.LevelVar)
-	logHandler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel})
-	logger := slog.New(logHandler)
-	slog.SetDefault(logger)
-	if config.Verbose {
-		logLevel.Set(slog.LevelDebug)
-	}
-
-	// Print version information.
-	slog.Info("starting redka", "version", version, "commit", commit, "built_at", date)
-
 	// Open the database.
-	opts := redka.Options{
-		DriverName: driverName,
-		Logger:     logger,
-		Pragma:     map[string]string{},
-	}
-	db, err := redka.Open(config.Path, &opts)
-	if err != nil {
-		slog.Error("data source", "error", err)
-		os.Exit(1)
-	}
-	slog.Info("data source", "path", config.Path)
+	db := mustOpenDB(config, logger)

-	// Create the server.
-	var srv *server.Server
-	if config.Sock != "" {
-		srv = server.New("unix", config.Sock, db)
-	} else {
-		srv = server.New("tcp", config.Addr(), db)
-	}
-
-	// Start the server.
-	var errCh = make(chan error, 1)
-	go func() {
-		if err := srv.Start(); err != nil {
-			errCh <- fmt.Errorf("start server: %w", err)
-		}
-	}()
-
-	// Start the debug server.
-	var debugSrv *server.DebugServer
-	if config.Verbose {
-		debugSrv = server.NewDebug("localhost", 6060)
-		go func() {
-			if err := debugSrv.Start(); err != nil {
-				errCh <- fmt.Errorf("start debug server: %w", err)
-			}
-		}()
-	}
+	// Start application and debug servers.
+	errCh := make(chan error, 1)
+	srv := startServer(config, db, errCh)
+	debugSrv := startDebugServer(config, errCh)

 	// Wait for a shutdown signal or a startup error.
 	select {
@@ -159,6 +106,120 @@ func main() {
 	}
 }

+// mustReadConfig reads the configuration from
+// command line arguments and environment variables.
+func mustReadConfig() Config {
+	if len(flag.Args()) > 1 {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	var config Config
+	flag.StringVar(
+		&config.Host, "h",
+		cmp.Or(os.Getenv("REDKA_HOST"), "localhost"),
+		"server host",
+	)
+	flag.StringVar(
+		&config.Port, "p",
+		cmp.Or(os.Getenv("REDKA_PORT"), "6379"),
+		"server port",
+	)
+	flag.StringVar(
+		&config.Sock, "s",
+		cmp.Or(os.Getenv("REDKA_SOCK"), ""),
+		"server socket (overrides host and port)",
+	)
+	flag.BoolVar(&config.Verbose, "v", false, "verbose logging")
+	flag.Parse()
+
+	config.Path = cmp.Or(flag.Arg(0), os.Getenv("REDKA_DB_URL"), sqliteMemoryURI)
+	return config
+}
+
+// setupLogger setups a logger for the application.
+func setupLogger(config Config) *slog.Logger {
+	logLevel := new(slog.LevelVar)
+	logHandler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel})
+	logger := slog.New(logHandler)
+	slog.SetDefault(logger)
+	if config.Verbose {
+		logLevel.Set(slog.LevelDebug)
+	}
+	return logger
+}
+
+// mustOpenDB connects to the database.
+func mustOpenDB(config Config, logger *slog.Logger) *redka.DB {
+	// Connect to the database using the inferred driver.
+	driverName := inferDriverName(config.Path)
+	opts := redka.Options{
+		DriverName: driverName,
+		Logger:     logger,
+		// Using nil for pragma sets the default options.
+		// We don't want any options, so pass an empty map instead.
+		Pragma: map[string]string{},
+	}
+	db, err := redka.Open(config.Path, &opts)
+	if err != nil {
+		slog.Error("data source", "error", err)
+		os.Exit(1)
+	}
+
+	// Hide password when logging.
+	maskedPath := config.Path
+	if u, err := url.Parse(maskedPath); err == nil && u.User != nil {
+		u.User = url.User(u.User.Username())
+		maskedPath = u.String()
+	}
+	slog.Info("data source", "driver", driverName, "path", maskedPath)
+
+	return db
+}
+
+// inferDriverName infers the driver name from the data source URI.
+func inferDriverName(path string) string {
+	// Infer the driver name based on the data source URI.
+	if strings.HasPrefix(path, "postgres://") {
+		return "postgres"
+	}
+	return sqliteDriverName
+}
+
+// startServer starts the application server.
+func startServer(config Config, db *redka.DB, errCh chan<- error) *server.Server {
+	// Create the server.
+	var srv *server.Server
+	if config.Sock != "" {
+		srv = server.New("unix", config.Sock, db)
+	} else {
+		srv = server.New("tcp", config.Addr(), db)
+	}
+
+	// Start the server.
+	go func() {
+		if err := srv.Start(); err != nil {
+			errCh <- fmt.Errorf("start server: %w", err)
+		}
+	}()
+
+	return srv
+}
+
+// startDebugServer starts the debug server.
+func startDebugServer(config Config, errCh chan<- error) *server.DebugServer {
+	if !config.Verbose {
+		return nil
+	}
+	srv := server.NewDebug("localhost", debugPort)
+	go func() {
+		if err := srv.Start(); err != nil {
+			errCh <- fmt.Errorf("start debug server: %w", err)
+		}
+	}()
+	return srv
+}
+
 // shutdown stops the main server and the debug server.
 func shutdown(srv *server.Server, debugSrv *server.DebugServer) {
 	// Stop the debug server.
--- a/docs/install-module.md
+++ b/docs/install-module.md
@@ -6,12 +6,18 @@ Install the module as follows:
 go get github.com/nalgeon/redka
 ```

-You'll also need an SQLite driver. Use one of the following:
+You'll also need an SQLite or PostgreSQL driver.
+
+Use one of the following for SQLite:

 -   `github.com/mattn/go-sqlite3` (CGO, fastest)
 -   `github.com/ncruces/go-sqlite3` (pure Go, WASM)
-   `github.com/tursodatabase/go-libsql` (CGO)
-   `modernc.org/sqlite` (pure Go)
+-   `modernc.org/sqlite` (pure Go, libc port)
+
+Or one of the following for PostgreSQL:
+
+-   `github.com/lib/pq`
+-   `github.com/jackc/pgx/v5`

 Install a driver with `go get` like this:

--- a/docs/performance.md
+++ b/docs/performance.md
@@ -7,21 +7,11 @@ I've compared Redka with Redis using [redis-benchmark](https://redis.io/docs/man
 -   10000 randomized keys
 -   GET/SET commands

-SQLite settings:
-
-```
-pragma journal_mode = wal;
-pragma synchronous = normal;
-pragma temp_store = memory;
-pragma mmap_size = 268435456;
-pragma foreign_keys = on;
-```
-
-Hardware: Apple M1 8-core CPU, 16GB RAM
+## Results

 Redis:

-```
+```text
 redis-server --appendonly no
 redis-benchmark -p 6379 -q -c 10 -n 1000000 -r 10000 -t get,set

@@ -29,9 +19,9 @@ SET: 133262.25 requests per second, p50=0.055 msec
 GET: 139217.59 requests per second, p50=0.055 msec
 ```

-Redka (in-memory):
+Redka (SQLite, in-memory):

-```
+```text
 ./redka -p 6380
 redis-benchmark -p 6380 -q -c 10 -n 1000000 -r 10000 -t get,set

@@ -39,14 +29,50 @@ SET: 36188.62  requests per second, p50=0.167 msec
 GET: 104405.93 requests per second, p50=0.063 msec
 ```

-Redka (persisted to disk):
+Redka (SQLite, persisted to disk):

-```
-./redka -p 6380 data.db
+```text
+./redka -p 6380 redka.db
 redis-benchmark -p 6380 -q -c 10 -n 1000000 -r 10000 -t get,set

 SET: 26773.76  requests per second, p50=0.215 msec
 GET: 103092.78 requests per second, p50=0.063 msec
 ```

-So while Redka is 2-5 times slower than Redis (not surprising, since we are comparing a relational database to a key-value data store), it can still do 26K writes/sec and 94K reads/sec, which is pretty good if you ask me.
+Redka (PostgreSQL):
+
+```text
+./redka -p 6380 "postgres://redka:redka@localhost:5432/redka?sslmode=disable"
+redis-benchmark -p 6380 -q -c 10 -n 100000 -r 10000 -t get,set
+
+SET: 11941.72 requests per second, p50=0.775 msec
+GET: 25766.55 requests per second, p50=0.359 msec
+```
+
+So while Redka is noticeably slower than Redis (not surprising, since we are comparing a relational database to a key-value data store), it can still handle tens of thousands of operations per second. That should be more than enough for many apps.
+
+## Environment
+
+Hardware: Apple M1 8-core CPU, 16GB RAM
+
+SQLite settings:
+
+```text
+pragma journal_mode = wal;
+pragma synchronous = normal;
+pragma temp_store = memory;
+pragma mmap_size = 268435456;
+pragma foreign_keys = on;
+```
+
+PostgreSQL settings:
+
+```text
+checkpoint_completion_target=0.9
+effective_cache_size=4GB
+maintenance_work_mem=512MB
+max_wal_size=1GB
+random_page_cost=1.1
+shared_buffers=1GB
+wal_buffers=16MB
+```
--- a/docs/persistence.md
+++ b/docs/persistence.md
@@ -1,6 +1,6 @@
 # Persistence

-Redka stores data in a SQLite database using the following tables:
+Redka stores data in a SQL database using the following tables:

 ```
 rkey
--- a/docs/usage-module.md
+++ b/docs/usage-module.md
@@ -47,19 +47,19 @@ After opening the database, call `redka.DB` methods to run individual commands:
 db.Str().Set("name", "alice")
 db.Str().Set("age", 25)

-count, err := db.Key().Count("name", "age", "city")
-slog.Info("count", "count", count, "err", err)
-
 name, err := db.Str().Get("name")
 slog.Info("get", "name", name, "err", err)
+
+age, err := db.Str().Get("age")
+slog.Info("get", "age", age, "err", err)
 ```

-```
-count count=2 err=<nil>
+```text
 get name="alice" err=<nil>
+get age="25" err=<nil>
 ```

-See the full example in [example/simple/main.go](../example/simple/main.go).
+See the full example in [example/mattn/main.go](../example/mattn/main.go).

 ## Transactions

@@ -84,7 +84,7 @@ err := db.Update(func(tx *redka.Tx) error {
 slog.Info("updated", "count", updCount, "err", err)
 ```

-```
+```text
 updated count=2 err=<nil>
 ```

@@ -94,7 +94,11 @@ See the full example in [example/tx/main.go](../example/tx/main.go).

 Redka supports the following SQLite drivers:

-   `github.com/mattn/go-sqlite3` ([example](../example/simple/main.go))
+-   `github.com/mattn/go-sqlite3` ([example](../example/mattn/main.go))
 -   `github.com/ncruces/go-sqlite3` ([example](../example/ncruces/main.go))
-   `github.com/tursodatabase/go-libsql` ([example](../example/libsql/main.go))
 -   `modernc.org/sqlite` ([example](../example/modernc/main.go))
+
+And the following Postgres drivers:
+
+-   `github.com/lib/pq` ([example](../example/postgres/main.go))
+-   `github.com/jackc/pgx/v5`
--- a/docs/usage-standalone.md
+++ b/docs/usage-standalone.md
@@ -9,10 +9,20 @@ redka [-h host] [-p port] [-s unix-socket] [db-path]
 For example:

 ```shell
+# use in-memory sqlite database
 ./redka
+
+# use file sqlite database
 ./redka data.db
+
+# listen on all network interfaces
 ./redka -h 0.0.0.0 -p 6379 data.db
+
+# listen on unix socket
 ./redka -s /tmp/redka.sock data.db
+
+# use postgres database
+./redka -p 6379 "postgres://redka:redka@localhost:5432/redka?sslmode=disable"
 ```

 Server defaults are host `localhost`, port `6379` and empty DB path. The unix socket path, if given, overrides the host/port arguments.
@@ -42,7 +52,7 @@ Once the server is running, connect to it using `redis-cli` or an API client lik
 redis-cli -h localhost -p 6379
 ```

-```
+```text
 127.0.0.1:6379> echo hello
 "hello"
 127.0.0.1:6379> set name alice
--- a/example/go.mod
+++ b/example/go.mod
@@ -2,29 +2,29 @@ module github.com/nalgeon/redka/example

 replace github.com/nalgeon/redka => ../

-go 1.22
+go 1.23.0
+
+toolchain go1.24.0

 require (
-	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/lib/pq v1.10.9
+	github.com/mattn/go-sqlite3 v1.14.28
 	github.com/nalgeon/redka v0.0.0-00010101000000-000000000000
 	github.com/ncruces/go-sqlite3 v0.16.2
-	github.com/tursodatabase/go-libsql v0.0.0-20240429120401-651096bbee0b
 	modernc.org/sqlite v1.29.5
 )

 require (
-	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
-	github.com/libsql/sqlite-antlr4-parser v0.0.0-20240327125255-dbf53b6cbf06 // indirect
 	github.com/mattn/go-isatty v0.0.16 // indirect
 	github.com/ncruces/go-strftime v0.1.9 // indirect
 	github.com/ncruces/julianday v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/tetratelabs/wazero v1.7.3 // indirect
-	golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 // indirect
 	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/tools v0.19.0 // indirect
 	modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 // indirect
 	modernc.org/libc v1.41.0 // indirect
 	modernc.org/mathutil v1.6.0 // indirect
--- a/example/go.sum
+++ b/example/go.sum
@@ -1,47 +1,33 @@
-github.com/antlr4-go/antlr/v4 v4.13.0 h1:lxCg3LAv+EUK6t1i0y1V6/SLeUi0eKEKdhQAlS8TVTI=
-github.com/antlr4-go/antlr/v4 v4.13.0/go.mod h1:pfChB/xh/Unjila75QW7+VU4TSnWnnk9UTnmpPaOR2g=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26/go.mod h1:dDKJzRmX4S37WGHujM7tX//fmj1uioxKzKxz3lo4HJo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
-github.com/libsql/sqlite-antlr4-parser v0.0.0-20240327125255-dbf53b6cbf06 h1:JLvn7D+wXjH9g4Jsjo+VqmzTUpl/LX7vfr6VOfSWTdM=
-github.com/libsql/sqlite-antlr4-parser v0.0.0-20240327125255-dbf53b6cbf06/go.mod h1:FUkZ5OHjlGPjnM2UyGJz9TypXQFgYqw6AFNO1UiROTM=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
-github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-github.com/ncruces/go-sqlite3 v0.16.2-0.20240609232415-e7f8311e2e0d h1:pq4oCRorhPT5EFOyw7OFkGXtJHJ/ViMDjBSmJlPV61g=
-github.com/ncruces/go-sqlite3 v0.16.2-0.20240609232415-e7f8311e2e0d/go.mod h1:feFXbBcbLtxNk6XWG1ROt8MS9+E45yCW3G8o4ixIqZ8=
+github.com/mattn/go-sqlite3 v1.14.28 h1:ThEiQrnbtumT+QMknw63Befp/ce/nUPgBPMlRFEum7A=
+github.com/mattn/go-sqlite3 v1.14.28/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/nalgeon/be v0.2.0 h1:i1Rsh0F+aNnHdbgph5Cy8Xm5uMVeWrUpm1olgzlPsMo=
+github.com/nalgeon/be v0.2.0/go.mod h1:PMwMuBLopwKJkSHnr2qHyLcZYUTqNejN7A8RAqNWO3E=
 github.com/ncruces/go-sqlite3 v0.16.2 h1:HesVRr0BC6QSGSEQfEXOntFWS9wd4Z8ms4nJzfUv4Rg=
 github.com/ncruces/go-sqlite3 v0.16.2/go.mod h1:wkUIvOrAjFQnefVlivJfcowKUcfMHs4mvLfhVanzHHI=
 github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
 github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
 github.com/ncruces/julianday v1.0.0 h1:fH0OKwa7NWvniGQtxdJRxAgkBMolni2BjDHaWTxqt7M=
 github.com/ncruces/julianday v1.0.0/go.mod h1:Dusn2KvZrrovOMJuOt0TNXL6tB7U2E8kvza5fFc9G7g=
-github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
-github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
-github.com/tetratelabs/wazero v1.7.2 h1:1+z5nXJNwMLPAWaTePFi49SSTL0IMx/i3Fg8Yc25GDc=
-github.com/tetratelabs/wazero v1.7.2/go.mod h1:ytl6Zuh20R/eROuyDaGPkp82O9C/DJfXAwJfQ3X6/7Y=
 github.com/tetratelabs/wazero v1.7.3 h1:PBH5KVahrt3S2AHgEjKu4u+LlDbbk+nsGE3KLucy6Rw=
 github.com/tetratelabs/wazero v1.7.3/go.mod h1:ytl6Zuh20R/eROuyDaGPkp82O9C/DJfXAwJfQ3X6/7Y=
-github.com/tursodatabase/go-libsql v0.0.0-20240429120401-651096bbee0b h1:R7hev4b96zgXjKbS2ZNbHBnDvyFZhH+LlMqtKH6hIkU=
-github.com/tursodatabase/go-libsql v0.0.0-20240429120401-651096bbee0b/go.mod h1:TjsB2miB8RW2Sse8sdxzVTdeGlx74GloD5zJYUC38d8=
-golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 h1:aAcj0Da7eBAtrTp03QXWvm88pSyOt+UgdZw2BFZ+lEw=
-golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8/go.mod h1:CQ1k9gNrJ50XIzaKCRR2hssIjF07kZFEiieALBM/ARQ=
 golang.org/x/mod v0.16.0 h1:QX4fJ0Rr5cPQCF7O9lh9Se4pmwfwskqZfq5moyldzic=
 golang.org/x/mod v0.16.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
-golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
-golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
@@ -49,8 +35,6 @@ golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
 golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
 golang.org/x/tools v0.19.0 h1:tfGCXNR1OsFG+sVdLAitlpjAvD/I6dHDKnYrpEZUHkw=
 golang.org/x/tools v0.19.0/go.mod h1:qoJWxmGSIBmAeriMx19ogtrEPrGtDbPK634QFIcLAhc=
-gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
-gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 modernc.org/fileutil v1.3.0 h1:gQ5SIzK3H9kdfai/5x41oQiKValumqNTDXMvKo62HvE=
 modernc.org/fileutil v1.3.0/go.mod h1:XatxS8fZi3pS8/hKG2GH/ArUogfxjpEKs3Ku3aK4JyQ=
 modernc.org/gc/v3 v3.0.0-20240107210532-573471604cb6 h1:5D53IMaUuA5InSeMu9eJtlQXS2NxAhyWQvkKEgXZhHI=
--- a/example/libsql/main.go
+++ b/example/libsql/main.go
@@ -1,37 +0,0 @@
-// An example of using Redka
-// with github.com/tursodatabase/go-libsql driver.
-package main
-
-import (
-	"log"
-	"log/slog"
-
-	"github.com/nalgeon/redka"
-	_ "github.com/tursodatabase/go-libsql"
-)
-
-func main() {
-	// libSQL uses a different driver name ("libsql" instead of "sqlite3").
-	// It also does not support the journal_mode and mmap_size pragmas
-	// (see https://github.com/tursodatabase/go-libsql/issues/28),
-	// so we have to turn them off.
-	opts := redka.Options{
-		DriverName: "libsql",
-		Pragma: map[string]string{
-			"synchronous":  "normal",
-			"temp_store":   "memory",
-			"foreign_keys": "on",
-		},
-	}
-	db, err := redka.Open("data.db", &opts)
-	if err != nil {
-		log.Fatal(err)
-	}
-	defer db.Close()
-
-	err = db.Str().Set("name", "alice")
-	slog.Info("set", "err", err)
-
-	count, err := db.Key().Count("name", "age", "city")
-	slog.Info("count", "count", count, "err", err)
-}
--- a/example/simple/main.go
+++ b/example/simple/main.go
@@ -11,24 +11,22 @@ import (
 )

 func main() {
-	// Open a database.
-	db, err := redka.Open("data.db", nil)
+	// Open the database.
+	db, err := redka.Open("redka.db", nil)
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer db.Close()
+	defer func() { _ = db.Close() }()

-	// Set some string keys.
+	// Set some values.
 	err = db.Str().Set("name", "alice")
 	slog.Info("set", "err", err)
 	err = db.Str().Set("age", 25)
 	slog.Info("set", "err", err)

-	// Check if the keys exist.
-	count, err := db.Key().Count("name", "age", "city")
-	slog.Info("count", "count", count, "err", err)
-
-	// Get a key.
+	// Read them back.
 	name, err := db.Str().Get("name")
 	slog.Info("get", "name", name, "err", err)
+	age, err := db.Str().Get("age")
+	slog.Info("get", "age", age, "err", err)
 }
--- a/example/modernc/main.go
+++ b/example/modernc/main.go
@@ -16,15 +16,23 @@ func main() {
 	opts := redka.Options{
 		DriverName: "sqlite",
 	}
-	db, err := redka.Open("data.db", &opts)
+
+	// Open the database.
+	db, err := redka.Open("redka.db", &opts)
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer db.Close()
+	defer func() { _ = db.Close() }()

+	// Set some values.
 	err = db.Str().Set("name", "alice")
 	slog.Info("set", "err", err)
+	err = db.Str().Set("age", 25)
+	slog.Info("set", "err", err)

-	count, err := db.Key().Count("name", "age", "city")
-	slog.Info("count", "count", count, "err", err)
+	// Read them back.
+	name, err := db.Str().Get("name")
+	slog.Info("get", "name", name, "err", err)
+	age, err := db.Str().Get("age")
+	slog.Info("get", "age", age, "err", err)
 }
--- a/example/ncruces/main.go
+++ b/example/ncruces/main.go
@@ -12,15 +12,22 @@ import (
 )

 func main() {
-	db, err := redka.Open("data.db", nil)
+	// Open the database.
+	db, err := redka.Open("redka.db", nil)
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer db.Close()
+	defer func() { _ = db.Close() }()

+	// Set some values.
 	err = db.Str().Set("name", "alice")
 	slog.Info("set", "err", err)
+	err = db.Str().Set("age", 25)
+	slog.Info("set", "err", err)

-	count, err := db.Key().Count("name", "age", "city")
-	slog.Info("count", "count", count, "err", err)
+	// Read them back.
+	name, err := db.Str().Get("name")
+	slog.Info("get", "name", name, "err", err)
+	age, err := db.Str().Get("age")
+	slog.Info("get", "age", age, "err", err)
 }
--- a/example/postgres/main.go
+++ b/example/postgres/main.go
@@ -0,0 +1,36 @@
+// An example of using Redka
+// with github.com/lib/pq driver.
+package main
+
+import (
+	"log"
+	"log/slog"
+
+	_ "github.com/lib/pq"
+	"github.com/nalgeon/redka"
+)
+
+func main() {
+	// Connections settings.
+	connString := "postgres://redka:redka@localhost:5432/redka?sslmode=disable"
+	opts := &redka.Options{DriverName: "postgres"}
+
+	// Open the database.
+	db, err := redka.Open(connString, opts)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer func() { _ = db.Close() }()
+
+	// Set some values.
+	err = db.Str().Set("name", "alice")
+	slog.Info("set", "err", err)
+	err = db.Str().Set("age", 25)
+	slog.Info("set", "err", err)
+
+	// Read them back.
+	name, err := db.Str().Get("name")
+	slog.Info("get", "name", name, "err", err)
+	age, err := db.Str().Get("age")
+	slog.Info("get", "age", age, "err", err)
+}
--- a/example/tx/main.go
+++ b/example/tx/main.go
@@ -10,11 +10,12 @@ import (
 )

 func main() {
-	db, err := redka.Open("data.db", nil)
+	// Open the database.
+	db, err := redka.Open("redka.db", nil)
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer db.Close()
+	defer func() { _ = db.Close() }()

 	{
 		// Writable transaction.
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,17 @@
 module github.com/nalgeon/redka

-go 1.22
+go 1.23.0

+toolchain go1.24.0
+
+// Main dependencies.
+require github.com/tidwall/redcon v1.6.2
+
+// Test dependencies.
 require (
-	github.com/mattn/go-sqlite3 v1.14.22
-	github.com/tidwall/redcon v1.6.2
+	github.com/lib/pq v1.10.9
+	github.com/mattn/go-sqlite3 v1.14.28
+	github.com/nalgeon/be v0.2.0
 )

 require (
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,9 @@
-github.com/mattn/go-sqlite3 v1.14.22 h1:2gZY6PC6kBnID23Tichd1K+Z0oS6nE/XwU+Vz/5o4kU=
-github.com/mattn/go-sqlite3 v1.14.22/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
+github.com/mattn/go-sqlite3 v1.14.28 h1:ThEiQrnbtumT+QMknw63Befp/ce/nUPgBPMlRFEum7A=
+github.com/mattn/go-sqlite3 v1.14.28/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/nalgeon/be v0.2.0 h1:i1Rsh0F+aNnHdbgph5Cy8Xm5uMVeWrUpm1olgzlPsMo=
+github.com/nalgeon/be v0.2.0/go.mod h1:PMwMuBLopwKJkSHnr2qHyLcZYUTqNejN7A8RAqNWO3E=
 github.com/tidwall/btree v1.1.0/go.mod h1:TzIRzen6yHbibdSfK6t8QimqbUnoxUSrZfeW7Uob0q4=
 github.com/tidwall/btree v1.7.0 h1:L1fkJH/AuEh5zBnnBbmTwQ5Lt+bRJ5A8EWecslvo9iI=
 github.com/tidwall/btree v1.7.0/go.mod h1:twD9XRA5jj9VUQGELzDO4HPQTNJsoWWfYEL+EUQ2cKY=
--- a/internal/command/conn/conn_test.go
+++ b/internal/command/conn/conn_test.go
@@ -3,15 +3,12 @@ package conn
 import (
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }
--- a/internal/command/conn/echo_test.go
+++ b/internal/command/conn/echo_test.go
@@ -3,8 +3,8 @@ package conn
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestEchoParse(t *testing.T) {
@@ -34,19 +34,18 @@ func TestEchoParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseEcho, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.parts, test.want)
+				be.Equal(t, cmd.parts, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Echo{})
+				be.Equal(t, cmd, Echo{})
 			}
 		})
 	}
 }

 func TestEchoExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

 	tests := []struct {
 		cmd string
@@ -70,9 +69,9 @@ func TestEchoExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseEcho, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/conn/ping_test.go
+++ b/internal/command/conn/ping_test.go
@@ -3,8 +3,8 @@ package conn
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestPingParse(t *testing.T) {
@@ -33,19 +33,18 @@ func TestPingParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParsePing, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.message, test.want)
+				be.Equal(t, cmd.message, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Ping{})
+				be.Equal(t, cmd, Ping{})
 			}
 		})
 	}
 }

 func TestPingExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

 	tests := []struct {
 		cmd string
@@ -69,9 +68,9 @@ func TestPingExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParsePing, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/conn/select_test.go
+++ b/internal/command/conn/select_test.go
@@ -3,8 +3,8 @@ package conn
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSelectParse(t *testing.T) {
@@ -33,19 +33,18 @@ func TestSelectParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSelect, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.index, test.want.index)
+				be.Equal(t, cmd.index, test.want.index)
 			} else {
-				testx.AssertEqual(t, cmd, Select{})
+				be.Equal(t, cmd, Select{})
 			}
 		})
 	}
 }

 func TestSelectExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

 	tests := []struct {
 		cmd string
@@ -64,9 +63,9 @@ func TestSelectExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseSelect, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/hash/hash_test.go
+++ b/internal/command/hash/hash_test.go
@@ -3,15 +3,12 @@ package hash
 import (
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }
--- a/internal/command/hash/hdel_test.go
+++ b/internal/command/hash/hdel_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHDelParse(t *testing.T) {
@@ -44,12 +44,12 @@ func TestHDelParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHDel, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.fields, test.fields)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.fields, test.fields)
 			} else {
-				testx.AssertEqual(t, cmd, HDel{})
+				be.Equal(t, cmd, HDel{})
 			}
 		})
 	}
@@ -57,66 +57,63 @@ func TestHDelParse(t *testing.T) {

 func TestHDelExec(t *testing.T) {
 	t.Run("one", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHDel, "hdel person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		_, err = db.Hash().Get("person", "name")
-		testx.AssertErr(t, err, core.ErrNotFound)
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "25")
+		_, err = red.Hash().Get("person", "name")
+		be.Err(t, err, core.ErrNotFound)
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "25")
 	})
 	t.Run("some", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
-		_, _ = db.Hash().Set("person", "happy", true)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)
+		_, _ = red.Hash().Set("person", "happy", true)

 		cmd := redis.MustParse(ParseHDel, "hdel person name happy city")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		_, err = db.Hash().Get("person", "name")
-		testx.AssertErr(t, err, core.ErrNotFound)
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "25")
-		_, err = db.Hash().Get("person", "happy")
-		testx.AssertErr(t, err, core.ErrNotFound)
+		_, err = red.Hash().Get("person", "name")
+		be.Err(t, err, core.ErrNotFound)
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "25")
+		_, err = red.Hash().Get("person", "happy")
+		be.Err(t, err, core.ErrNotFound)
 	})
 	t.Run("all", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHDel, "hdel person name age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		_, err = db.Hash().Get("person", "name")
-		testx.AssertErr(t, err, core.ErrNotFound)
-		_, err = db.Hash().Get("person", "age")
-		testx.AssertErr(t, err, core.ErrNotFound)
+		_, err = red.Hash().Get("person", "name")
+		be.Err(t, err, core.ErrNotFound)
+		_, err = red.Hash().Get("person", "age")
+		be.Err(t, err, core.ErrNotFound)
 	})
 }
--- a/internal/command/hash/hexists_test.go
+++ b/internal/command/hash/hexists_test.go
@@ -3,8 +3,8 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHExistsParse(t *testing.T) {
@@ -43,12 +43,12 @@ func TestHExistsParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHExists, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.field, test.field)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.field, test.field)
 			} else {
-				testx.AssertEqual(t, cmd, HExists{})
+				be.Equal(t, cmd, HExists{})
 			}
 		})
 	}
@@ -56,43 +56,40 @@ func TestHExistsParse(t *testing.T) {

 func TestHExistsExec(t *testing.T) {
 	t.Run("field found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHExists, "hexists person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")
 	})
 	t.Run("field not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHExists, "hexists person age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHExists, "hexists person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/hash/hget_test.go
+++ b/internal/command/hash/hget_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHGetParse(t *testing.T) {
@@ -44,12 +44,12 @@ func TestHGetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHGet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.field, test.field)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.field, test.field)
 			} else {
-				testx.AssertEqual(t, cmd, HGet{})
+				be.Equal(t, cmd, HGet{})
 			}
 		})
 	}
@@ -57,43 +57,38 @@ func TestHGetParse(t *testing.T) {

 func TestHGetExec(t *testing.T) {
 	t.Run("field found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHGet, "hget person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("alice"))
-		testx.AssertEqual(t, conn.Out(), "alice")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("alice"))
+		be.Equal(t, conn.Out(), "alice")
 	})
 	t.Run("field not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHGet, "hget person age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHGet, "hget person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/hash/hgetall_test.go
+++ b/internal/command/hash/hgetall_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHGetAllParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestHGetAllParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHGetAll, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, HGetAll{})
+				be.Equal(t, cmd, HGetAll{})
 			}
 		})
 	}
@@ -46,34 +46,31 @@ func TestHGetAllParse(t *testing.T) {

 func TestHGetAllExec(t *testing.T) {
 	t.Run("key found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHGetAll, "hgetall person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, map[string]core.Value{
+		be.Err(t, err, nil)
+		be.Equal(t, res.(map[string]core.Value), map[string]core.Value{
 			"name": core.Value("alice"), "age": core.Value("25"),
 		})
-		testx.AssertEqual(t,
+		be.Equal(t,
 			conn.Out() == "4,name,alice,age,25" || conn.Out() == "4,age,25,name,alice",
 			true)
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHGetAll, "hgetall person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, map[string]core.Value{})
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(map[string]core.Value), map[string]core.Value{})
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/hash/hincrby_test.go
+++ b/internal/command/hash/hincrby_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHIncrByParse(t *testing.T) {
@@ -46,13 +46,13 @@ func TestHIncrByParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHIncrBy, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.field, test.field)
-				testx.AssertEqual(t, cmd.delta, test.delta)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.field, test.field)
+				be.Equal(t, cmd.delta, test.delta)
 			} else {
-				testx.AssertEqual(t, cmd, HIncrBy{})
+				be.Equal(t, cmd, HIncrBy{})
 			}
 		})
 	}
@@ -60,69 +60,62 @@ func TestHIncrByParse(t *testing.T) {

 func TestHIncrByExec(t *testing.T) {
 	t.Run("incr field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHIncrBy, "hincrby person age 10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 35)
-		testx.AssertEqual(t, conn.Out(), "35")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 35)
+		be.Equal(t, conn.Out(), "35")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("35"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("35"))
 	})
 	t.Run("decr field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHIncrBy, "hincrby person age -10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 15)
-		testx.AssertEqual(t, conn.Out(), "15")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 15)
+		be.Equal(t, conn.Out(), "15")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("15"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("15"))
 	})
 	t.Run("create field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHIncrBy, "hincrby person age 10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 10)
-		testx.AssertEqual(t, conn.Out(), "10")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 10)
+		be.Equal(t, conn.Out(), "10")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("10"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("10"))
 	})
 	t.Run("create key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHIncrBy, "hincrby person age 10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 10)
-		testx.AssertEqual(t, conn.Out(), "10")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 10)
+		be.Equal(t, conn.Out(), "10")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("10"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("10"))
 	})
 }
--- a/internal/command/hash/hincrbyfloat_test.go
+++ b/internal/command/hash/hincrbyfloat_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHIncrByFloatParse(t *testing.T) {
@@ -46,13 +46,13 @@ func TestHIncrByFloatParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHIncrByFloat, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.field, test.field)
-				testx.AssertEqual(t, cmd.delta, test.delta)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.field, test.field)
+				be.Equal(t, cmd.delta, test.delta)
 			} else {
-				testx.AssertEqual(t, cmd, HIncrByFloat{})
+				be.Equal(t, cmd, HIncrByFloat{})
 			}
 		})
 	}
@@ -60,69 +60,62 @@ func TestHIncrByFloatParse(t *testing.T) {

 func TestHIncrByFloatExec(t *testing.T) {
 	t.Run("incr field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHIncrByFloat, "hincrbyfloat person age 10.5")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 35.5)
-		testx.AssertEqual(t, conn.Out(), "35.5")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 35.5)
+		be.Equal(t, conn.Out(), "35.5")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("35.5"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("35.5"))
 	})
 	t.Run("decr field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHIncrByFloat, "hincrbyfloat person age -10.5")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 14.5)
-		testx.AssertEqual(t, conn.Out(), "14.5")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 14.5)
+		be.Equal(t, conn.Out(), "14.5")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("14.5"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("14.5"))
 	})
 	t.Run("create field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHIncrByFloat, "hincrbyfloat person age 10.5")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 10.5)
-		testx.AssertEqual(t, conn.Out(), "10.5")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 10.5)
+		be.Equal(t, conn.Out(), "10.5")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("10.5"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("10.5"))
 	})
 	t.Run("create key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHIncrByFloat, "hincrbyfloat person age 10.5")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 10.5)
-		testx.AssertEqual(t, conn.Out(), "10.5")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 10.5)
+		be.Equal(t, conn.Out(), "10.5")

-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age, core.Value("10.5"))
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age, core.Value("10.5"))
 	})
 }
--- a/internal/command/hash/hkeys_test.go
+++ b/internal/command/hash/hkeys_test.go
@@ -1,10 +1,11 @@
 package hash

 import (
+	"slices"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHKeysParse(t *testing.T) {
@@ -33,11 +34,11 @@ func TestHKeysParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHKeys, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, HKeys{})
+				be.Equal(t, cmd, HKeys{})
 			}
 		})
 	}
@@ -45,32 +46,30 @@ func TestHKeysParse(t *testing.T) {

 func TestHKeysExec(t *testing.T) {
 	t.Run("key found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHKeys, "hkeys person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []string{"age", "name"})
-		testx.AssertEqual(t,
-			conn.Out() == "2,age,name" || conn.Out() == "2,name,age",
-			true)
+		be.Err(t, err, nil)
+		got := res.([]string)
+		slices.Sort(got)
+		be.Equal(t, got, []string{"age", "name"})
+		be.True(t, conn.Out() == "2,age,name" || conn.Out() == "2,name,age")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHKeys, "hkeys person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []string{})
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]string), []string{})
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/hash/hlen_test.go
+++ b/internal/command/hash/hlen_test.go
@@ -3,8 +3,8 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHLenParse(t *testing.T) {
@@ -33,11 +33,11 @@ func TestHLenParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHLen, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, HLen{})
+				be.Equal(t, cmd, HLen{})
 			}
 		})
 	}
@@ -45,30 +45,27 @@ func TestHLenParse(t *testing.T) {

 func TestHLenExec(t *testing.T) {
 	t.Run("key found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHLen, "hlen person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHLen, "hlen person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/hash/hmget_test.go
+++ b/internal/command/hash/hmget_test.go
@@ -3,9 +3,9 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHMGetParse(t *testing.T) {
@@ -44,12 +44,12 @@ func TestHMGetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHMGet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.fields, test.fields)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.fields, test.fields)
 			} else {
-				testx.AssertEqual(t, cmd, HMGet{})
+				be.Equal(t, cmd, HMGet{})
 			}
 		})
 	}
@@ -57,58 +57,52 @@ func TestHMGetParse(t *testing.T) {

 func TestHMGetExec(t *testing.T) {
 	t.Run("one field", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHMGet, "hmget person name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, conn.Out(), "1,alice")
+		be.Err(t, err, nil)
+		be.Equal(t, conn.Out(), "1,alice")
 		items := res.([]core.Value)
-		testx.AssertEqual(t, len(items), 1)
-		testx.AssertEqual(t, items[0], core.Value("alice"))
+		be.Equal(t, len(items), 1)
+		be.Equal(t, items[0], core.Value("alice"))
 	})
 	t.Run("some fields", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
-		_, _ = db.Hash().Set("person", "happy", true)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)
+		_, _ = red.Hash().Set("person", "happy", true)

 		cmd := redis.MustParse(ParseHMGet, "hmget person name happy city")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, conn.Out(), "3,alice,1,(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, conn.Out(), "3,alice,1,(nil)")
 		items := res.([]core.Value)
-		testx.AssertEqual(t, len(items), 3)
-		testx.AssertEqual(t, items[0], core.Value("alice"))
-		testx.AssertEqual(t, items[1], core.Value("1"))
-		testx.AssertEqual(t, items[2], core.Value(nil))
+		be.Equal(t, len(items), 3)
+		be.Equal(t, items[0], core.Value("alice"))
+		be.Equal(t, items[1], core.Value("1"))
+		be.Equal(t, items[2], core.Value(nil))
 	})
 	t.Run("all fields", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHMGet, "hmget person name age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, conn.Out(), "2,alice,25")
+		be.Err(t, err, nil)
+		be.Equal(t, conn.Out(), "2,alice,25")
 		items := res.([]core.Value)
-		testx.AssertEqual(t, len(items), 2)
-		testx.AssertEqual(t, items[0], core.Value("alice"))
-		testx.AssertEqual(t, items[1], core.Value("25"))
+		be.Equal(t, len(items), 2)
+		be.Equal(t, items[0], core.Value("alice"))
+		be.Equal(t, items[1], core.Value("25"))
 	})
 }
--- a/internal/command/hash/hmset_test.go
+++ b/internal/command/hash/hmset_test.go
@@ -3,8 +3,8 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHMSetParse(t *testing.T) {
@@ -51,12 +51,12 @@ func TestHMSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHMSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.items, test.want.items)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.items, test.want.items)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -64,73 +64,67 @@ func TestHMSetParse(t *testing.T) {

 func TestHMSetExec(t *testing.T) {
 	t.Run("create single", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHMSet, "hmset person name alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("create multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHMSet, "hmset person name alice age 25")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "25")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "25")
 	})

 	t.Run("create/update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHMSet, "hmset person name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "50")
 	})

 	t.Run("update multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHMSet, "hmset person name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "50")
 	})
 }
--- a/internal/command/hash/hscan_test.go
+++ b/internal/command/hash/hscan_test.go
@@ -1,12 +1,13 @@
 package hash

 import (
+	"fmt"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
 	"github.com/nalgeon/redka/internal/rhash"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHScanParse(t *testing.T) {
@@ -103,57 +104,62 @@ func TestHScanParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHScan, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.cursor, test.cursor)
-				testx.AssertEqual(t, cmd.match, test.match)
-				testx.AssertEqual(t, cmd.count, test.count)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.cursor, test.cursor)
+				be.Equal(t, cmd.match, test.match)
+				be.Equal(t, cmd.count, test.count)
 			} else {
-				testx.AssertEqual(t, cmd, HScan{})
+				be.Equal(t, cmd, HScan{})
 			}
 		})
 	}
 }

 func TestHScanExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

-	_, _ = db.Hash().Set("key", "f11", "11")
-	_, _ = db.Hash().Set("key", "f12", "12")
-	_, _ = db.Hash().Set("key", "f21", "21")
-	_, _ = db.Hash().Set("key", "f22", "22")
-	_, _ = db.Hash().Set("key", "f31", "31")
+	_, _ = red.Hash().Set("key", "f11", "11")
+	_, _ = red.Hash().Set("key", "f12", "12")
+	_, _ = red.Hash().Set("key", "f21", "21")
+	_, _ = red.Hash().Set("key", "f22", "22")
+	_, _ = red.Hash().Set("key", "f31", "31")

 	t.Run("hscan all", func(t *testing.T) {
+		var cursor int
 		{
+			// page 1
 			cmd := redis.MustParse(ParseHScan, "hscan key 0")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Items), 5)
-			testx.AssertEqual(t, sres.Items[0].Field, "f11")
-			testx.AssertEqual(t, sres.Items[0].Value, core.Value("11"))
-			testx.AssertEqual(t, sres.Items[4].Field, "f31")
-			testx.AssertEqual(t, sres.Items[4].Value, core.Value("31"))
-			testx.AssertEqual(t, conn.Out(), "2,5,10,f11,11,f12,12,f21,21,f22,22,f31,31")
+			be.True(t, sres.Cursor > 0)
+			be.Equal(t, len(sres.Items), 5)
+			be.Equal(t, sres.Items[0].Field, "f11")
+			be.Equal(t, sres.Items[0].Value, core.Value("11"))
+			be.Equal(t, sres.Items[4].Field, "f31")
+			be.Equal(t, sres.Items[4].Value, core.Value("31"))
+			wantOut := fmt.Sprintf("2,%d,10,f11,11,f12,12,f21,21,f22,22,f31,31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
-			cmd := redis.MustParse(ParseHScan, "hscan key 5")
+			// page 2 (empty)
+			next := fmt.Sprintf("hscan key %d", cursor)
+			cmd := redis.MustParse(ParseHScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Items), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Items), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})

@@ -162,80 +168,91 @@ func TestHScanExec(t *testing.T) {
 		conn := redis.NewFakeConn()

 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)

 		sres := res.(rhash.ScanResult)
-		testx.AssertEqual(t, sres.Cursor, 4)
-		testx.AssertEqual(t, len(sres.Items), 2)
-		testx.AssertEqual(t, sres.Items[0].Field, "f21")
-		testx.AssertEqual(t, sres.Items[0].Value, core.Value("21"))
-		testx.AssertEqual(t, sres.Items[1].Field, "f22")
-		testx.AssertEqual(t, sres.Items[1].Value, core.Value("22"))
-		testx.AssertEqual(t, conn.Out(), "2,4,4,f21,21,f22,22")
+		be.True(t, sres.Cursor > 0)
+		be.Equal(t, len(sres.Items), 2)
+		be.Equal(t, sres.Items[0].Field, "f21")
+		be.Equal(t, sres.Items[0].Value, core.Value("21"))
+		be.Equal(t, sres.Items[1].Field, "f22")
+		be.Equal(t, sres.Items[1].Value, core.Value("22"))
+		wantOut := fmt.Sprintf("2,%d,4,f21,21,f22,22", sres.Cursor)
+		be.Equal(t, conn.Out(), wantOut)
 	})

 	t.Run("hscan count", func(t *testing.T) {
+		var cursor int
 		{
 			// page 1
 			cmd := redis.MustParse(ParseHScan, "hscan key 0 match * count 2")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 2)
-			testx.AssertEqual(t, len(sres.Items), 2)
-			testx.AssertEqual(t, sres.Items[0].Field, "f11")
-			testx.AssertEqual(t, sres.Items[0].Value, core.Value("11"))
-			testx.AssertEqual(t, sres.Items[1].Field, "f12")
-			testx.AssertEqual(t, sres.Items[1].Value, core.Value("12"))
-			testx.AssertEqual(t, conn.Out(), "2,2,4,f11,11,f12,12")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Items), 2)
+			be.Equal(t, sres.Items[0].Field, "f11")
+			be.Equal(t, sres.Items[0].Value, core.Value("11"))
+			be.Equal(t, sres.Items[1].Field, "f12")
+			be.Equal(t, sres.Items[1].Value, core.Value("12"))
+			wantOut := fmt.Sprintf("2,%d,4,f11,11,f12,12", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 2
-			cmd := redis.MustParse(ParseHScan, "hscan key 2 match * count 2")
+			next := fmt.Sprintf("hscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseHScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 4)
-			testx.AssertEqual(t, len(sres.Items), 2)
-			testx.AssertEqual(t, sres.Items[0].Field, "f21")
-			testx.AssertEqual(t, sres.Items[0].Value, core.Value("21"))
-			testx.AssertEqual(t, sres.Items[1].Field, "f22")
-			testx.AssertEqual(t, sres.Items[1].Value, core.Value("22"))
-			testx.AssertEqual(t, conn.Out(), "2,4,4,f21,21,f22,22")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Items), 2)
+			be.Equal(t, sres.Items[0].Field, "f21")
+			be.Equal(t, sres.Items[0].Value, core.Value("21"))
+			be.Equal(t, sres.Items[1].Field, "f22")
+			be.Equal(t, sres.Items[1].Value, core.Value("22"))
+			wantOut := fmt.Sprintf("2,%d,4,f21,21,f22,22", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 3
-			cmd := redis.MustParse(ParseHScan, "hscan key 4 match * count 2")
+			next := fmt.Sprintf("hscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseHScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Items), 1)
-			testx.AssertEqual(t, sres.Items[0].Field, "f31")
-			testx.AssertEqual(t, sres.Items[0].Value, core.Value("31"))
-			testx.AssertEqual(t, conn.Out(), "2,5,2,f31,31")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Items), 1)
+			be.Equal(t, sres.Items[0].Field, "f31")
+			be.Equal(t, sres.Items[0].Value, core.Value("31"))
+			wantOut := fmt.Sprintf("2,%d,2,f31,31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// no more pages
-			cmd := redis.MustParse(ParseHScan, "hscan key 5 match * count 2")
+			next := fmt.Sprintf("hscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseHScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rhash.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Items), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Items), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})
 }
--- a/internal/command/hash/hset_test.go
+++ b/internal/command/hash/hset_test.go
@@ -3,8 +3,8 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHSetParse(t *testing.T) {
@@ -51,12 +51,12 @@ func TestHSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.items, test.want.items)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.items, test.want.items)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -64,73 +64,67 @@ func TestHSetParse(t *testing.T) {

 func TestHSetExec(t *testing.T) {
 	t.Run("create single", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHSet, "hset person name alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("create multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHSet, "hset person name alice age 25")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "25")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "25")
 	})

 	t.Run("create/update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHSet, "hset person name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "50")
 	})

 	t.Run("update multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHSet, "hset person name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Hash().Get("person", "age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Hash().Get("person", "age")
+		be.Equal(t, age.String(), "50")
 	})
 }
--- a/internal/command/hash/hsetnx_test.go
+++ b/internal/command/hash/hsetnx_test.go
@@ -3,8 +3,8 @@ package hash
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHSetNXParse(t *testing.T) {
@@ -43,12 +43,12 @@ func TestHSetNXParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHSetNX, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.value, test.want.value)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.value, test.want.value)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -56,34 +56,31 @@ func TestHSetNXParse(t *testing.T) {

 func TestHSetNXExec(t *testing.T) {
 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHSetNX, "hsetnx person name alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")

 		cmd := redis.MustParse(ParseHSetNX, "hsetnx person name bob")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		name, _ := db.Hash().Get("person", "name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Hash().Get("person", "name")
+		be.Equal(t, name.String(), "alice")
 	})
 }
--- a/internal/command/hash/hvals_test.go
+++ b/internal/command/hash/hvals_test.go
@@ -1,11 +1,12 @@
 package hash

 import (
+	"slices"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestHValsParse(t *testing.T) {
@@ -34,11 +35,11 @@ func TestHValsParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseHVals, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, HVals{})
+				be.Equal(t, cmd, HVals{})
 			}
 		})
 	}
@@ -46,30 +47,32 @@ func TestHValsParse(t *testing.T) {

 func TestHValsExec(t *testing.T) {
 	t.Run("key found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_, _ = db.Hash().Set("person", "name", "alice")
-		_, _ = db.Hash().Set("person", "age", 25)
+		red := getRedka(t)
+		_, _ = red.Hash().Set("person", "name", "alice")
+		_, _ = red.Hash().Set("person", "age", 25)

 		cmd := redis.MustParse(ParseHVals, "hvals person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{core.Value("25"), core.Value("alice")})
-		testx.AssertEqual(t, conn.Out(), "2,25,alice")
+		be.Err(t, err, nil)
+		var got []string
+		for _, val := range res.([]core.Value) {
+			got = append(got, val.String())
+		}
+		slices.Sort(got)
+		be.Equal(t, got, []string{"25", "alice"})
+		be.True(t, conn.Out() == "2,25,alice" || conn.Out() == "2,alice,25")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseHVals, "hvals person")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)

-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{})
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value{})
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/key/del_test.go
+++ b/internal/command/key/del_test.go
@@ -3,9 +3,9 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestDelParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestDelParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseDel, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want)
+				be.Equal(t, cmd.keys, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Del{})
+				be.Equal(t, cmd, Del{})
 			}
 		})
 	}
@@ -69,24 +69,23 @@ func TestDelExec(t *testing.T) {

 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
-			db, red := getDB(t)
-			defer db.Close()
+			red := getRedka(t)

-			_ = db.Str().Set("name", "alice")
-			_ = db.Str().Set("age", 50)
-			_ = db.Str().Set("city", "paris")
+			_ = red.Str().Set("name", "alice")
+			_ = red.Str().Set("age", 50)
+			_ = red.Str().Set("city", "paris")

 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseDel, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)

-			_, err = db.Str().Get("name")
-			testx.AssertErr(t, err, core.ErrNotFound)
-			city, _ := db.Str().Get("city")
-			testx.AssertEqual(t, city.String(), "paris")
+			_, err = red.Str().Get("name")
+			be.Err(t, err, core.ErrNotFound)
+			city, _ := red.Str().Get("city")
+			be.Equal(t, city.String(), "paris")
 		})
 	}
 }
--- a/internal/command/key/exists_test.go
+++ b/internal/command/key/exists_test.go
@@ -3,8 +3,8 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestExistsParse(t *testing.T) {
@@ -33,23 +33,22 @@ func TestExistsParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseExists, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want)
+				be.Equal(t, cmd.keys, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Exists{})
+				be.Equal(t, cmd, Exists{})
 			}
 		})
 	}
 }

 func TestExistsExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

-	_ = db.Str().Set("name", "alice")
-	_ = db.Str().Set("age", 50)
-	_ = db.Str().Set("city", "paris")
+	_ = red.Str().Set("name", "alice")
+	_ = red.Str().Set("age", 50)
+	_ = red.Str().Set("city", "paris")

 	tests := []struct {
 		cmd string
@@ -78,9 +77,9 @@ func TestExistsExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseExists, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/key/expire_test.go
+++ b/internal/command/key/expire_test.go
@@ -4,8 +4,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestExpireParse(t *testing.T) {
@@ -54,12 +54,12 @@ func TestExpireParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.ttl, test.ttl)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.ttl, test.ttl)
 			} else {
-				testx.AssertEqual(t, cmd, Expire{})
+				be.Equal(t, cmd, Expire{})
 			}
 		})
 	}
@@ -70,89 +70,79 @@ func TestExpireExec(t *testing.T) {
 		return ParseExpire(b, 1000)
 	}
 	t.Run("create expire", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expire name 60")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

 		expireAt := time.Now().Add(60 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
 	})

 	t.Run("update expire", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().SetExpires("name", "alice", 60*time.Second)
+		red := getRedka(t)
+		_ = red.Str().SetExpires("name", "alice", 60*time.Second)

 		cmd := redis.MustParse(parse, "expire name 30")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

 		expireAt := time.Now().Add(30 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
 	})

 	t.Run("set to zero", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expire name 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("negative", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expire name -10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expire age 60")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("age")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("age")
+		be.Equal(t, key.Exists(), false)
 	})
 }
--- a/internal/command/key/expireat_test.go
+++ b/internal/command/key/expireat_test.go
@@ -5,8 +5,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestExpireAtParse(t *testing.T) {
@@ -55,12 +55,12 @@ func TestExpireAtParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.at.Unix(), test.at.Unix())
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.at.Unix(), test.at.Unix())
 			} else {
-				testx.AssertEqual(t, cmd, ExpireAt{})
+				be.Equal(t, cmd, ExpireAt{})
 			}
 		})
 	}
@@ -71,96 +71,86 @@ func TestExpireAtExec(t *testing.T) {
 		return ParseExpireAt(b, 1000)
 	}
 	t.Run("create expireat", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		expireAt := time.Now().Add(60 * time.Second)
 		cmd := redis.MustParse(parse, fmt.Sprintf("expireat name %d", expireAt.Unix()))
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
 	})

 	t.Run("update expire", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		expireAt := time.Now()
 		cmd := redis.MustParse(parse, fmt.Sprintf("expireat name %d", expireAt.Add(60*time.Second).Unix()))
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

 		cmd = redis.MustParse(parse, fmt.Sprintf("expireat name %d", expireAt.Add(20*time.Second).Unix()))
 		conn = redis.NewFakeConn()
 		res, err = cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.Add(20*time.Second).UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.Add(20*time.Second).UnixMilli()/1000)
 	})

 	t.Run("set to zero", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expireat name 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("negative", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expireat name -10")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "expireat age 1700000000")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("age")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("age")
+		be.Equal(t, key.Exists(), false)
 	})
 }
--- a/internal/command/key/flushdb_test.go
+++ b/internal/command/key/flushdb_test.go
@@ -3,8 +3,8 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestFlushDBParse(t *testing.T) {
@@ -29,9 +29,9 @@ func TestFlushDBParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseFlushDB, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err != nil {
-				testx.AssertEqual(t, cmd, FlushDB{})
+				be.Equal(t, cmd, FlushDB{})
 			}
 		})
 	}
@@ -39,35 +39,32 @@ func TestFlushDBParse(t *testing.T) {

 func TestFlushDBExec(t *testing.T) {
 	t.Run("full", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("age", 25)
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("age", 25)

 		cmd := redis.MustParse(ParseFlushDB, "flushdb")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		keys, _ := db.Key().Keys("*")
-		testx.AssertEqual(t, len(keys), 0)
+		keys, _ := red.Key().Keys("*")
+		be.Equal(t, len(keys), 0)
 	})

 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseFlushDB, "flushdb")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		keys, _ := db.Key().Keys("*")
-		testx.AssertEqual(t, len(keys), 0)
+		keys, _ := red.Key().Keys("*")
+		be.Equal(t, len(keys), 0)
 	})
 }
--- a/internal/command/key/key_test.go
+++ b/internal/command/key/key_test.go
@@ -3,15 +3,12 @@ package key
 import (
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }
--- a/internal/command/key/keys_test.go
+++ b/internal/command/key/keys_test.go
@@ -3,9 +3,9 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestKeysParse(t *testing.T) {
@@ -39,25 +39,24 @@ func TestKeysParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseKeys, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.pattern, test.want)
+				be.Equal(t, cmd.pattern, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Keys{})
+				be.Equal(t, cmd, Keys{})
 			}
 		})
 	}
 }

 func TestKeysExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

-	_ = db.Str().Set("k11", "11")
-	_ = db.Str().Set("k12", "12")
-	_ = db.Str().Set("k21", "21")
-	_ = db.Str().Set("k22", "22")
-	_ = db.Str().Set("k31", "31")
+	_ = red.Str().Set("k11", "11")
+	_ = red.Str().Set("k12", "12")
+	_ = red.Str().Set("k21", "21")
+	_ = red.Str().Set("k22", "22")
+	_ = red.Str().Set("k31", "31")

 	tests := []struct {
 		cmd string
@@ -91,11 +90,11 @@ func TestKeysExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseKeys, test.cmd)
 			keys, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)
 			for i, key := range keys.([]core.Key) {
-				testx.AssertEqual(t, key.Key, test.res[i])
+				be.Equal(t, key.Key, test.res[i])
 			}
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/key/persist_test.go
+++ b/internal/command/key/persist_test.go
@@ -4,8 +4,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestPersistParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestPersistParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParsePersist, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, Persist{})
+				be.Equal(t, cmd, Persist{})
 			}
 		})
 	}
@@ -46,53 +46,47 @@ func TestPersistParse(t *testing.T) {

 func TestPersistExec(t *testing.T) {
 	t.Run("persist to persist", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParsePersist, "persist name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.ETime, (*int64)(nil))
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.ETime, (*int64)(nil))
 	})

 	t.Run("volatile to persist", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().SetExpires("name", "alice", 60*time.Second)
+		red := getRedka(t)
+		_ = red.Str().SetExpires("name", "alice", 60*time.Second)

 		cmd := redis.MustParse(ParsePersist, "persist name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.ETime, (*int64)(nil))
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.ETime, (*int64)(nil))
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParsePersist, "persist age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("age")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("age")
+		be.Equal(t, key.Exists(), false)
 	})
 }
--- a/internal/command/key/pexpire_test.go
+++ b/internal/command/key/pexpire_test.go
@@ -4,8 +4,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestPExpireParse(t *testing.T) {
@@ -54,12 +54,12 @@ func TestPExpireParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.ttl, test.ttl)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.ttl, test.ttl)
 			} else {
-				testx.AssertEqual(t, cmd, Expire{})
+				be.Equal(t, cmd, Expire{})
 			}
 		})
 	}
@@ -71,84 +71,79 @@ func TestPExpireExec(t *testing.T) {
 	}

 	t.Run("create pexpire", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "pexpire name 60000")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

 		expireAt := time.Now().Add(60 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
 	})

 	t.Run("update pexpire", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().SetExpires("name", "alice", 60*time.Second)
+		red := getRedka(t)
+		_ = red.Str().SetExpires("name", "alice", 60*time.Second)

 		cmd := redis.MustParse(parse, "pexpire name 30000")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

 		expireAt := time.Now().Add(30 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
 	})

 	t.Run("set to zero", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "pexpire name 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("negative", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "pexpire name -1000")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "pexpire age 1000")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("age")
-		testx.AssertEqual(t, key.Exists(), false)
+		key, _ := red.Key().Get("age")
+		be.Equal(t, key.Exists(), false)
 	})
 }
--- a/internal/command/key/randomkey_test.go
+++ b/internal/command/key/randomkey_test.go
@@ -4,9 +4,9 @@ import (
 	"slices"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRandomKeyParse(t *testing.T) {
@@ -31,9 +31,9 @@ func TestRandomKeyParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRandomKey, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err != nil {
-				testx.AssertEqual(t, cmd, RandomKey{})
+				be.Equal(t, cmd, RandomKey{})
 			}
 		})
 	}
@@ -41,28 +41,26 @@ func TestRandomKeyParse(t *testing.T) {

 func TestRandomKeyExec(t *testing.T) {
 	t.Run("found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("age", 25)
-		_ = db.Str().Set("city", "paris")
-		keys := []string{"name", "age", "city"}
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("age", 25)
+		_ = red.Str().Set("city", "paris")

 		conn := redis.NewFakeConn()
 		cmd := redis.MustParse(ParseRandomKey, "randomkey")
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, slices.Contains(keys, res.(core.Key).Key), true)
-		testx.AssertEqual(t, slices.Contains(keys, conn.Out()), true)
+		be.Err(t, err, nil)
+		keys := []string{"name", "age", "city"}
+		be.True(t, slices.Contains(keys, res.(core.Key).Key))
+		be.True(t, slices.Contains(keys, conn.Out()))
 	})
 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)
 		conn := redis.NewFakeConn()
 		cmd := redis.MustParse(ParseRandomKey, "randomkey")
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/key/rename_test.go
+++ b/internal/command/key/rename_test.go
@@ -3,9 +3,9 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRenameParse(t *testing.T) {
@@ -38,12 +38,12 @@ func TestRenameParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRename, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.newKey, test.newKey)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.newKey, test.newKey)
 			} else {
-				testx.AssertEqual(t, cmd, Rename{})
+				be.Equal(t, cmd, Rename{})
 			}
 		})
 	}
@@ -51,83 +51,75 @@ func TestRenameParse(t *testing.T) {

 func TestRenameExec(t *testing.T) {
 	t.Run("create new", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseRename, "rename name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
 	})

 	t.Run("replace existing", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("title", "bob")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("title", "bob")

 		cmd := redis.MustParse(ParseRename, "rename name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("title")
-		testx.AssertEqual(t, val.String(), "alice")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("title")
+		be.Equal(t, val.String(), "alice")
 	})

 	t.Run("rename to self", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseRename, "rename name name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("name")
-		testx.AssertEqual(t, val.String(), "alice")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("name")
+		be.Equal(t, val.String(), "alice")
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("title", "bob")
+		red := getRedka(t)
+		_ = red.Str().Set("title", "bob")

 		cmd := redis.MustParse(ParseRename, "rename name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertEqual(t, err, core.ErrNotFound)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), redis.ErrNotFound.Error()+" (rename)")
+		be.Equal(t, err, core.ErrNotFound)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), redis.ErrNotFound.Error()+" (rename)")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("title")
-		testx.AssertEqual(t, val.String(), "bob")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("title")
+		be.Equal(t, val.String(), "bob")
 	})
 }
--- a/internal/command/key/renamenx_test.go
+++ b/internal/command/key/renamenx_test.go
@@ -3,9 +3,9 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRenameNXParse(t *testing.T) {
@@ -38,12 +38,12 @@ func TestRenameNXParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRenameNX, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.newKey, test.newKey)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.newKey, test.newKey)
 			} else {
-				testx.AssertEqual(t, cmd, RenameNX{})
+				be.Equal(t, cmd, RenameNX{})
 			}
 		})
 	}
@@ -51,85 +51,77 @@ func TestRenameNXParse(t *testing.T) {

 func TestRenameNXExec(t *testing.T) {
 	t.Run("create new", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseRenameNX, "renamenx name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
 	})

 	t.Run("replace existing", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("title", "bob")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("title", "bob")

 		cmd := redis.MustParse(ParseRenameNX, "renamenx name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("name")
-		testx.AssertEqual(t, val.String(), "alice")
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ = db.Str().Get("title")
-		testx.AssertEqual(t, val.String(), "bob")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("name")
+		be.Equal(t, val.String(), "alice")
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
+		val, _ = red.Str().Get("title")
+		be.Equal(t, val.String(), "bob")
 	})

 	t.Run("rename to self", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseRenameNX, "renamenx name name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("name")
-		testx.AssertEqual(t, val.String(), "alice")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("name")
+		be.Equal(t, val.String(), "alice")
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("title", "bob")
+		red := getRedka(t)
+		_ = red.Str().Set("title", "bob")

 		cmd := redis.MustParse(ParseRenameNX, "renamenx name title")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertEqual(t, err, core.ErrNotFound)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), redis.ErrNotFound.Error()+" (renamenx)")
+		be.Equal(t, err, core.ErrNotFound)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), redis.ErrNotFound.Error()+" (renamenx)")

-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, key.Exists(), false)
-		key, _ = db.Key().Get("title")
-		testx.AssertEqual(t, key.Exists(), true)
-		val, _ := db.Str().Get("title")
-		testx.AssertEqual(t, val.String(), "bob")
+		key, _ := red.Key().Get("name")
+		be.Equal(t, key.Exists(), false)
+		key, _ = red.Key().Get("title")
+		be.Equal(t, key.Exists(), true)
+		val, _ := red.Str().Get("title")
+		be.Equal(t, val.String(), "bob")
 	})
 }
--- a/internal/command/key/scan_test.go
+++ b/internal/command/key/scan_test.go
@@ -1,11 +1,12 @@
 package key

 import (
+	"fmt"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
 	"github.com/nalgeon/redka/internal/rkey"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestScanParse(t *testing.T) {
@@ -108,14 +109,14 @@ func TestScanParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseScan, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.cursor, test.cursor)
-				testx.AssertEqual(t, cmd.match, test.match)
-				testx.AssertEqual(t, cmd.ktype, test.ktype)
-				testx.AssertEqual(t, cmd.count, test.count)
+				be.Equal(t, cmd.cursor, test.cursor)
+				be.Equal(t, cmd.match, test.match)
+				be.Equal(t, cmd.ktype, test.ktype)
+				be.Equal(t, cmd.count, test.count)
 			} else {
-				testx.AssertEqual(t, cmd, Scan{})
+				be.Equal(t, cmd, Scan{})
 			}
 		})
 	}
@@ -123,152 +124,164 @@ func TestScanParse(t *testing.T) {

 func TestScanExec(t *testing.T) {
 	t.Run("scan all", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("k11", "11")
-		_ = db.Str().Set("k12", "12")
-		_ = db.Str().Set("k21", "21")
-		_ = db.Str().Set("k22", "22")
-		_ = db.Str().Set("k31", "31")
+		_ = red.Str().Set("k11", "11")
+		_ = red.Str().Set("k12", "12")
+		_ = red.Str().Set("k21", "21")
+		_ = red.Str().Set("k22", "22")
+		_ = red.Str().Set("k31", "31")

+		var cursor int
 		{
 			cmd := redis.MustParse(ParseScan, "scan 0")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Keys), 5)
-			testx.AssertEqual(t, sres.Keys[0].Key, "k11")
-			testx.AssertEqual(t, sres.Keys[4].Key, "k31")
-			testx.AssertEqual(t, conn.Out(), "2,5,5,k11,k12,k21,k22,k31")
+			be.True(t, sres.Cursor > 0)
+			be.Equal(t, len(sres.Keys), 5)
+			be.Equal(t, sres.Keys[0].Key, "k11")
+			be.Equal(t, sres.Keys[4].Key, "k31")
+			wantOut := fmt.Sprintf("2,%d,5,k11,k12,k21,k22,k31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
-			cmd := redis.MustParse(ParseScan, "scan 5")
+			next := fmt.Sprintf("scan %d", cursor)
+			cmd := redis.MustParse(ParseScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Keys), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Keys), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})
 	t.Run("scan pattern", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("k11", "11")
-		_ = db.Str().Set("k12", "12")
-		_ = db.Str().Set("k21", "21")
-		_ = db.Str().Set("k22", "22")
-		_ = db.Str().Set("k31", "31")
+		_ = red.Str().Set("k11", "11")
+		_ = red.Str().Set("k12", "12")
+		_ = red.Str().Set("k21", "21")
+		_ = red.Str().Set("k22", "22")
+		_ = red.Str().Set("k31", "31")

 		cmd := redis.MustParse(ParseScan, "scan 0 match k2*")
 		conn := redis.NewFakeConn()

 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)

 		sres := res.(rkey.ScanResult)
-		testx.AssertEqual(t, sres.Cursor, 4)
-		testx.AssertEqual(t, len(sres.Keys), 2)
-		testx.AssertEqual(t, sres.Keys[0].Key, "k21")
-		testx.AssertEqual(t, sres.Keys[1].Key, "k22")
-		testx.AssertEqual(t, conn.Out(), "2,4,2,k21,k22")
+		be.True(t, sres.Cursor > 0)
+		be.Equal(t, len(sres.Keys), 2)
+		be.Equal(t, sres.Keys[0].Key, "k21")
+		be.Equal(t, sres.Keys[1].Key, "k22")
+		wantOut := fmt.Sprintf("2,%d,2,k21,k22", sres.Cursor)
+		be.Equal(t, conn.Out(), wantOut)
 	})
 	t.Run("scan type", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("t1", "str")
-		_, _ = db.List().PushBack("t2", "elem")
-		_, _ = db.Hash().Set("t4", "field", "value")
-		_, _ = db.ZSet().Add("t5", "elem", 11)
+		_ = red.Str().Set("t1", "str")
+		_, _ = red.List().PushBack("t2", "elem")
+		_, _ = red.Hash().Set("t4", "field", "value")
+		_, _ = red.ZSet().Add("t5", "elem", 11)

 		cmd := redis.MustParse(ParseScan, "scan 0 match t* type hash")
 		conn := redis.NewFakeConn()

 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)

 		sres := res.(rkey.ScanResult)
-		testx.AssertEqual(t, sres.Cursor, 3)
-		testx.AssertEqual(t, len(sres.Keys), 1)
-		testx.AssertEqual(t, sres.Keys[0].Key, "t4")
-		testx.AssertEqual(t, conn.Out(), "2,3,1,t4")
+		be.True(t, sres.Cursor > 0)
+		be.Equal(t, len(sres.Keys), 1)
+		be.Equal(t, sres.Keys[0].Key, "t4")
+		wantOut := fmt.Sprintf("2,%d,1,t4", sres.Cursor)
+		be.Equal(t, conn.Out(), wantOut)
 	})
 	t.Run("scan count", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("k11", "11")
-		_ = db.Str().Set("k12", "12")
-		_ = db.Str().Set("k21", "21")
-		_ = db.Str().Set("k22", "22")
-		_ = db.Str().Set("k31", "31")
+		_ = red.Str().Set("k11", "11")
+		_ = red.Str().Set("k12", "12")
+		_ = red.Str().Set("k21", "21")
+		_ = red.Str().Set("k22", "22")
+		_ = red.Str().Set("k31", "31")

+		var cursor int
 		{
 			// page 1
 			cmd := redis.MustParse(ParseScan, "scan 0 match * count 2")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 2)
-			testx.AssertEqual(t, len(sres.Keys), 2)
-			testx.AssertEqual(t, sres.Keys[0].Key, "k11")
-			testx.AssertEqual(t, sres.Keys[1].Key, "k12")
-			testx.AssertEqual(t, conn.Out(), "2,2,2,k11,k12")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Keys), 2)
+			be.Equal(t, sres.Keys[0].Key, "k11")
+			be.Equal(t, sres.Keys[1].Key, "k12")
+			wantOut := fmt.Sprintf("2,%d,2,k11,k12", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 2
-			cmd := redis.MustParse(ParseScan, "scan 2 match * count 2")
+			next := fmt.Sprintf("scan %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 4)
-			testx.AssertEqual(t, len(sres.Keys), 2)
-			testx.AssertEqual(t, sres.Keys[0].Key, "k21")
-			testx.AssertEqual(t, sres.Keys[1].Key, "k22")
-			testx.AssertEqual(t, conn.Out(), "2,4,2,k21,k22")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Keys), 2)
+			be.Equal(t, sres.Keys[0].Key, "k21")
+			be.Equal(t, sres.Keys[1].Key, "k22")
+			wantOut := fmt.Sprintf("2,%d,2,k21,k22", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 3
-			cmd := redis.MustParse(ParseScan, "scan 4 match * count 2")
+			next := fmt.Sprintf("scan %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Keys), 1)
-			testx.AssertEqual(t, sres.Keys[0].Key, "k31")
-			testx.AssertEqual(t, conn.Out(), "2,5,1,k31")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Keys), 1)
+			be.Equal(t, sres.Keys[0].Key, "k31")
+			wantOut := fmt.Sprintf("2,%d,1,k31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// no more pages
-			cmd := redis.MustParse(ParseScan, "scan 5 match * count 2")
+			next := fmt.Sprintf("scan %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rkey.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Keys), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Keys), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})
 }
--- a/internal/command/key/ttl_test.go
+++ b/internal/command/key/ttl_test.go
@@ -4,8 +4,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestTTLParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestTTLParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseTTL, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, TTL{})
+				be.Equal(t, cmd, TTL{})
 			}
 		})
 	}
@@ -46,42 +46,37 @@ func TestTTLParse(t *testing.T) {

 func TestTTLExec(t *testing.T) {
 	t.Run("has ttl", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().SetExpires("name", "alice", 60*time.Second)
+		red := getRedka(t)
+		_ = red.Str().SetExpires("name", "alice", 60*time.Second)

 		cmd := redis.MustParse(ParseTTL, "ttl name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 60)
-		testx.AssertEqual(t, conn.Out(), "60")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 60)
+		be.Equal(t, conn.Out(), "60")
 	})

 	t.Run("no ttl", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseTTL, "ttl name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, -1)
-		testx.AssertEqual(t, conn.Out(), "-1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, -1)
+		be.Equal(t, conn.Out(), "-1")
 	})

 	t.Run("not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseTTL, "ttl name")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, -2)
-		testx.AssertEqual(t, conn.Out(), "-2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, -2)
+		be.Equal(t, conn.Out(), "-2")
 	})
 }
--- a/internal/command/key/type_test.go
+++ b/internal/command/key/type_test.go
@@ -3,8 +3,8 @@ package key
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestTypeParse(t *testing.T) {
@@ -33,24 +33,23 @@ func TestTypeParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseType, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
+				be.Equal(t, cmd.key, test.key)
 			} else {
-				testx.AssertEqual(t, cmd, Type{})
+				be.Equal(t, cmd, Type{})
 			}
 		})
 	}
 }

 func TestTypeExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

-	_ = db.Str().Set("kstr", "string")
-	_, _ = db.List().PushBack("klist", "list")
-	_, _ = db.Hash().Set("khash", "field", "hash")
-	_, _ = db.ZSet().Add("kzset", "zset", 1)
+	_ = red.Str().Set("kstr", "string")
+	_, _ = red.List().PushBack("klist", "list")
+	_, _ = red.Hash().Set("khash", "field", "hash")
+	_, _ = red.ZSet().Add("kzset", "zset", 1)

 	tests := []struct {
 		key  string
@@ -68,9 +67,9 @@ func TestTypeExec(t *testing.T) {
 			cmd := redis.MustParse(ParseType, "type "+test.key)
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.want)
-			testx.AssertEqual(t, conn.Out(), test.want)
+			be.Err(t, err, nil)
+			be.Equal(t, res.(string), test.want)
+			be.Equal(t, conn.Out(), test.want)
 		})
 	}
 }
--- a/internal/command/list/lindex_test.go
+++ b/internal/command/list/lindex_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLIndexParse(t *testing.T) {
@@ -39,12 +39,12 @@ func TestLIndexParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLIndex, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.index, test.want.index)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.index, test.want.index)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -52,78 +52,72 @@ func TestLIndexParse(t *testing.T) {

 func TestLIndexExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLIndex, "lindex key 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("single elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLIndex, "lindex key 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("elem"))
-		testx.AssertEqual(t, conn.Out(), "elem")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("elem"))
+		be.Equal(t, conn.Out(), "elem")
 	})
 	t.Run("multiple elems", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLIndex, "lindex key 1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("two"))
-		testx.AssertEqual(t, conn.Out(), "two")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("two"))
+		be.Equal(t, conn.Out(), "two")
 	})
 	t.Run("list index out of bounds", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLIndex, "lindex key 1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("negative index", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLIndex, "lindex key -2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("two"))
-		testx.AssertEqual(t, conn.Out(), "two")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("two"))
+		be.Equal(t, conn.Out(), "two")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLIndex, "lindex key 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/list/linsert_test.go
+++ b/internal/command/list/linsert_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLInsertParse(t *testing.T) {
@@ -55,14 +55,14 @@ func TestLInsertParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLInsert, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.where, test.want.where)
-				testx.AssertEqual(t, cmd.pivot, test.want.pivot)
-				testx.AssertEqual(t, cmd.elem, test.want.elem)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.where, test.want.where)
+				be.Equal(t, cmd.pivot, test.want.pivot)
+				be.Equal(t, cmd.elem, test.want.elem)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -70,90 +70,84 @@ func TestLInsertParse(t *testing.T) {

 func TestLInsertExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLInsert, "linsert key before pivot elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		_, err = db.List().Get("key", 0)
-		testx.AssertEqual(t, err, core.ErrNotFound)
+		_, err = red.List().Get("key", 0)
+		be.Equal(t, err, core.ErrNotFound)
 	})
 	t.Run("insert before first", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, err := db.List().PushBack("key", "pivot")
-		testx.AssertNoErr(t, err)
+		red := getRedka(t)
+		_, err := red.List().PushBack("key", "pivot")
+		be.Err(t, err, nil)

 		cmd := redis.MustParse(ParseLInsert, "linsert key before pivot elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		elem, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, elem, core.Value("elem"))
+		elem, _ := red.List().Get("key", 0)
+		be.Equal(t, elem, core.Value("elem"))
 	})
 	t.Run("insert before middle", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLInsert, "linsert key before thr two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 3)
-		testx.AssertEqual(t, conn.Out(), "3")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 3)
+		be.Equal(t, conn.Out(), "3")

-		elem, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, elem, core.Value("two"))
+		elem, _ := red.List().Get("key", 1)
+		be.Equal(t, elem, core.Value("two"))
 	})
 	t.Run("insert after middle", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLInsert, "linsert key after thr two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 3)
-		testx.AssertEqual(t, conn.Out(), "3")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 3)
+		be.Equal(t, conn.Out(), "3")

-		elem, _ := db.List().Get("key", 2)
-		testx.AssertEqual(t, elem, core.Value("two"))
+		elem, _ := red.List().Get("key", 2)
+		be.Equal(t, elem, core.Value("two"))
 	})
 	t.Run("elem not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")

 		cmd := redis.MustParse(ParseLInsert, "linsert key before thr two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, -1)
-		testx.AssertEqual(t, conn.Out(), "-1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, -1)
+		be.Equal(t, conn.Out(), "-1")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLInsert, "linsert key before pivot elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/list/list_test.go
+++ b/internal/command/list/list_test.go
@@ -3,15 +3,12 @@ package list
 import (
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }
--- a/internal/command/list/llen_test.go
+++ b/internal/command/list/llen_test.go
@@ -3,8 +3,8 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLLenParse(t *testing.T) {
@@ -33,11 +33,11 @@ func TestLLenParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLLen, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -45,52 +45,48 @@ func TestLLenParse(t *testing.T) {

 func TestLLenExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLLen, "llen key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("single elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLLen, "llen key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")
 	})
 	t.Run("multiple elems", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLLen, "llen key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 3)
-		testx.AssertEqual(t, conn.Out(), "3")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 3)
+		be.Equal(t, conn.Out(), "3")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLLen, "llen key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/list/lpop_test.go
+++ b/internal/command/list/lpop_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLPopParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestLPopParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLPop, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,62 +46,58 @@ func TestLPopParse(t *testing.T) {

 func TestLPopExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLPop, "lpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("pop elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLPop, "lpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("elem"))
-		testx.AssertEqual(t, conn.Out(), "elem")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("elem"))
+		be.Equal(t, conn.Out(), "elem")
 	})
 	t.Run("pop multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		{
 			cmd := redis.MustParse(ParseLPop, "lpop key")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("one"))
-			testx.AssertEqual(t, conn.Out(), "one")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("one"))
+			be.Equal(t, conn.Out(), "one")
 		}
 		{
 			cmd := redis.MustParse(ParseLPop, "lpop key")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("two"))
-			testx.AssertEqual(t, conn.Out(), "two")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("two"))
+			be.Equal(t, conn.Out(), "two")
 		}
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLPop, "lpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/list/lpush_test.go
+++ b/internal/command/list/lpush_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLPushParse(t *testing.T) {
@@ -39,10 +39,10 @@ func TestLPushParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLPush, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.elem, test.want.elem)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.elem, test.want.elem)
 			}
 		})
 	}
@@ -50,70 +50,66 @@ func TestLPushParse(t *testing.T) {

 func TestLPushExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLPush, "lpush key elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		elem, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, elem.String(), "elem")
+		elem, _ := red.List().Get("key", 0)
+		be.Equal(t, elem.String(), "elem")
 	})
 	t.Run("add elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")

 		cmd := redis.MustParse(ParseLPush, "lpush key two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		elem, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, elem.String(), "two")
+		elem, _ := red.List().Get("key", 0)
+		be.Equal(t, elem.String(), "two")
 	})
 	t.Run("add miltiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		{
 			cmd := redis.MustParse(ParseLPush, "lpush key one")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, 1)
-			testx.AssertEqual(t, conn.Out(), "1")
+			be.Err(t, err, nil)
+			be.Equal(t, res, 1)
+			be.Equal(t, conn.Out(), "1")
 		}
 		{
 			cmd := redis.MustParse(ParseLPush, "lpush key two")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, 2)
-			testx.AssertEqual(t, conn.Out(), "2")
+			be.Err(t, err, nil)
+			be.Equal(t, res, 2)
+			be.Equal(t, conn.Out(), "2")
 		}

-		el0, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, el0.String(), "two")
-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "one")
+		el0, _ := red.List().Get("key", 0)
+		be.Equal(t, el0.String(), "two")
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "one")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLPush, "lpush key elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (lpush)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (lpush)")
 	})
 }
--- a/internal/command/list/lrange_test.go
+++ b/internal/command/list/lrange_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLRangeParse(t *testing.T) {
@@ -39,13 +39,13 @@ func TestLRangeParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLRange, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.start, test.want.start)
-				testx.AssertEqual(t, cmd.stop, test.want.stop)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.start, test.want.start)
+				be.Equal(t, cmd.stop, test.want.stop)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -53,94 +53,87 @@ func TestLRangeParse(t *testing.T) {

 func TestLRangeExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLRange, "lrange key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("single elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLRange, "lrange key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{core.Value("elem")})
-		testx.AssertEqual(t, conn.Out(), "1,elem")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value{core.Value("elem")})
+		be.Equal(t, conn.Out(), "1,elem")
 	})
 	t.Run("multiple elems", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLRange, "lrange key 0 1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{core.Value("one"), core.Value("two")})
-		testx.AssertEqual(t, conn.Out(), "2,one,two")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, conn.Out(), "2,one,two")
 	})
 	t.Run("negative indexes", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLRange, "lrange key -2 -1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{core.Value("two"), core.Value("thr")})
-		testx.AssertEqual(t, conn.Out(), "2,two,thr")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value{core.Value("two"), core.Value("thr")})
+		be.Equal(t, conn.Out(), "2,two,thr")
 	})
 	t.Run("out of bounds", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLRange, "lrange key 3 5")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("start < stop", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLRange, "lrange key 2 1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLRange, "lrange key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/list/lrem_test.go
+++ b/internal/command/list/lrem_test.go
@@ -3,8 +3,8 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLRemParse(t *testing.T) {
@@ -43,13 +43,13 @@ func TestLRemParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLRem, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.count, test.want.count)
-				testx.AssertEqual(t, cmd.elem, test.want.elem)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.count, test.want.count)
+				be.Equal(t, cmd.elem, test.want.elem)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -57,120 +57,113 @@ func TestLRemParse(t *testing.T) {

 func TestLRemExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLRem, "lrem key 1 elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("delete elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLRem, "lrem key 1 elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 0)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 0)
 	})
 	t.Run("delete front", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "fou")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "fou")

 		cmd := redis.MustParse(ParseLRem, "lrem key 2 two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 4)
-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "thr")
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 4)
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "thr")
 	})
 	t.Run("delete back", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "fou")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "fou")

 		cmd := redis.MustParse(ParseLRem, "lrem key -2 two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 4)
-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "two")
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 4)
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "two")
 	})
 	t.Run("delete all", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "fou")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "fou")

 		cmd := redis.MustParse(ParseLRem, "lrem key 0 two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 3)
-		testx.AssertEqual(t, conn.Out(), "3")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 3)
+		be.Equal(t, conn.Out(), "3")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 3)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 3)
 	})
 	t.Run("elem not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLRem, "lrem key 1 other")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 1)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 1)
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLRem, "lrem key 1 elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/list/lset_test.go
+++ b/internal/command/list/lset_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLSetParse(t *testing.T) {
@@ -44,13 +44,13 @@ func TestLSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.index, test.want.index)
-				testx.AssertEqual(t, cmd.elem, test.want.elem)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.index, test.want.index)
+				be.Equal(t, cmd.elem, test.want.elem)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -58,72 +58,67 @@ func TestLSetParse(t *testing.T) {

 func TestLSetExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLSet, "lset key 0 elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrNotFound)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
+		be.Err(t, err, core.ErrNotFound)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
 	})
 	t.Run("set elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLSet, "lset key 1 upd")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), "OK")

-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "upd")
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "upd")
 	})
 	t.Run("negative index", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLSet, "lset key -1 upd")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), "OK")

-		el2, _ := db.List().Get("key", 2)
-		testx.AssertEqual(t, el2.String(), "upd")
+		el2, _ := red.List().Get("key", 2)
+		be.Equal(t, el2.String(), "upd")
 	})
 	t.Run("index out of bounds", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLSet, "lset key 1 upd")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrNotFound)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
+		be.Err(t, err, core.ErrNotFound)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLSet, "lset key 0 elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrNotFound)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
+		be.Err(t, err, core.ErrNotFound)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), redis.ErrOutOfRange.Error()+" (lset)")
 	})
 }
--- a/internal/command/list/ltrim_test.go
+++ b/internal/command/list/ltrim_test.go
@@ -3,8 +3,8 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLTrimParse(t *testing.T) {
@@ -33,13 +33,13 @@ func TestLTrimParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLTrim, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.start, test.want.start)
-				testx.AssertEqual(t, cmd.stop, test.want.stop)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.start, test.want.start)
+				be.Equal(t, cmd.stop, test.want.stop)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -47,98 +47,92 @@ func TestLTrimParse(t *testing.T) {

 func TestLTrimExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "OK")
 	})
 	t.Run("keep single elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "OK")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 1)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 1)
 	})
 	t.Run("keep multiple elems", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
-		_, _ = db.List().PushBack("key", "fou")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")
+		_, _ = red.List().PushBack("key", "fou")

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 1 2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "OK")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 2)
-		el0, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, el0.String(), "two")
-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "thr")
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 2)
+		el0, _ := red.List().Get("key", 0)
+		be.Equal(t, el0.String(), "two")
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "thr")
 	})
 	t.Run("negative index", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
-		_, _ = db.List().PushBack("key", "fou")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")
+		_, _ = red.List().PushBack("key", "fou")

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 0 -1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "OK")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 4)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 4)
 	})
 	t.Run("start > stop", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 2 1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 3)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 3)
+		be.Equal(t, conn.Out(), "OK")

-		count, _ := db.List().Len("key")
-		testx.AssertEqual(t, count, 0)
+		count, _ := red.List().Len("key")
+		be.Equal(t, count, 0)
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseLTrim, "ltrim key 0 0")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "OK")
 	})
 }
--- a/internal/command/list/rpop_test.go
+++ b/internal/command/list/rpop_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRPopParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestRPopParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRPop, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,62 +46,58 @@ func TestRPopParse(t *testing.T) {

 func TestRPopExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseRPop, "rpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("pop elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "elem")

 		cmd := redis.MustParse(ParseRPop, "rpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("elem"))
-		testx.AssertEqual(t, conn.Out(), "elem")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("elem"))
+		be.Equal(t, conn.Out(), "elem")
 	})
 	t.Run("pop multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
-		_, _ = db.List().PushBack("key", "two")
-		_, _ = db.List().PushBack("key", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")
+		_, _ = red.List().PushBack("key", "two")
+		_, _ = red.List().PushBack("key", "thr")

 		{
 			cmd := redis.MustParse(ParseRPop, "rpop key")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("thr"))
-			testx.AssertEqual(t, conn.Out(), "thr")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("thr"))
+			be.Equal(t, conn.Out(), "thr")
 		}
 		{
 			cmd := redis.MustParse(ParseRPop, "rpop key")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("two"))
-			testx.AssertEqual(t, conn.Out(), "two")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("two"))
+			be.Equal(t, conn.Out(), "two")
 		}
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseRPop, "rpop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/list/rpoplpush_test.go
+++ b/internal/command/list/rpoplpush_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRPopLPushParse(t *testing.T) {
@@ -34,12 +34,12 @@ func TestRPopLPushParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRPopLPush, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.src, test.want.src)
-				testx.AssertEqual(t, cmd.dst, test.want.dst)
+				be.Equal(t, cmd.src, test.want.src)
+				be.Equal(t, cmd.dst, test.want.dst)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -47,101 +47,96 @@ func TestRPopLPushParse(t *testing.T) {

 func TestRPopLPushExec(t *testing.T) {
 	t.Run("src not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src dst")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("pop elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("src", "elem")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("src", "elem")

 		cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src dst")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("elem"))
-		testx.AssertEqual(t, conn.Out(), "elem")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("elem"))
+		be.Equal(t, conn.Out(), "elem")

-		count, _ := db.List().Len("src")
-		testx.AssertEqual(t, count, 0)
-		count, _ = db.List().Len("dst")
-		testx.AssertEqual(t, count, 1)
+		count, _ := red.List().Len("src")
+		be.Equal(t, count, 0)
+		count, _ = red.List().Len("dst")
+		be.Equal(t, count, 1)
 	})
 	t.Run("pop multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("src", "one")
-		_, _ = db.List().PushBack("src", "two")
-		_, _ = db.List().PushBack("src", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("src", "one")
+		_, _ = red.List().PushBack("src", "two")
+		_, _ = red.List().PushBack("src", "thr")

 		{
 			cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src dst")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("thr"))
-			testx.AssertEqual(t, conn.Out(), "thr")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("thr"))
+			be.Equal(t, conn.Out(), "thr")
 		}
 		{
 			cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src dst")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("two"))
-			testx.AssertEqual(t, conn.Out(), "two")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("two"))
+			be.Equal(t, conn.Out(), "two")
 		}

-		count, _ := db.List().Len("src")
-		testx.AssertEqual(t, count, 1)
-		count, _ = db.List().Len("dst")
-		testx.AssertEqual(t, count, 2)
+		count, _ := red.List().Len("src")
+		be.Equal(t, count, 1)
+		count, _ = red.List().Len("dst")
+		be.Equal(t, count, 2)
 	})
 	t.Run("push to self", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("src", "one")
-		_, _ = db.List().PushBack("src", "two")
-		_, _ = db.List().PushBack("src", "thr")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("src", "one")
+		_, _ = red.List().PushBack("src", "two")
+		_, _ = red.List().PushBack("src", "thr")

 		{
 			cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src src")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("thr"))
-			testx.AssertEqual(t, conn.Out(), "thr")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("thr"))
+			be.Equal(t, conn.Out(), "thr")
 		}
 		{
 			cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src src")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, core.Value("two"))
-			testx.AssertEqual(t, conn.Out(), "two")
+			be.Err(t, err, nil)
+			be.Equal(t, res.(core.Value), core.Value("two"))
+			be.Equal(t, conn.Out(), "two")
 		}

-		elems, _ := db.List().Range("src", 0, -1)
-		testx.AssertEqual(t, elems[0].String(), "two")
-		testx.AssertEqual(t, elems[1].String(), "thr")
-		testx.AssertEqual(t, elems[2].String(), "one")
+		elems, _ := red.List().Range("src", 0, -1)
+		be.Equal(t, elems[0].String(), "two")
+		be.Equal(t, elems[1].String(), "thr")
+		be.Equal(t, elems[2].String(), "one")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("src", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("src", "str")

 		cmd := redis.MustParse(ParseRPopLPush, "rpoplpush src dst")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/list/rpush_test.go
+++ b/internal/command/list/rpush_test.go
@@ -3,9 +3,9 @@ package list
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestRPushParse(t *testing.T) {
@@ -39,12 +39,12 @@ func TestRPushParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseRPush, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.elem, test.want.elem)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.elem, test.want.elem)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -52,70 +52,66 @@ func TestRPushParse(t *testing.T) {

 func TestRPushExec(t *testing.T) {
 	t.Run("empty list", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseRPush, "rpush key elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		elem, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, elem.String(), "elem")
+		elem, _ := red.List().Get("key", 0)
+		be.Equal(t, elem.String(), "elem")
 	})
 	t.Run("add elem", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.List().PushBack("key", "one")
+		red := getRedka(t)
+		_, _ = red.List().PushBack("key", "one")

 		cmd := redis.MustParse(ParseRPush, "rpush key two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		elem, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, elem.String(), "two")
+		elem, _ := red.List().Get("key", 1)
+		be.Equal(t, elem.String(), "two")
 	})
 	t.Run("add miltiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		{
 			cmd := redis.MustParse(ParseRPush, "rpush key one")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, 1)
-			testx.AssertEqual(t, conn.Out(), "1")
+			be.Err(t, err, nil)
+			be.Equal(t, res, 1)
+			be.Equal(t, conn.Out(), "1")
 		}
 		{
 			cmd := redis.MustParse(ParseRPush, "rpush key two")
 			conn := redis.NewFakeConn()
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, 2)
-			testx.AssertEqual(t, conn.Out(), "2")
+			be.Err(t, err, nil)
+			be.Equal(t, res, 2)
+			be.Equal(t, conn.Out(), "2")
 		}

-		el0, _ := db.List().Get("key", 0)
-		testx.AssertEqual(t, el0.String(), "one")
-		el1, _ := db.List().Get("key", 1)
-		testx.AssertEqual(t, el1.String(), "two")
+		el0, _ := red.List().Get("key", 0)
+		be.Equal(t, el0.String(), "one")
+		el1, _ := red.List().Get("key", 1)
+		be.Equal(t, el1.String(), "two")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseRPush, "rpush key elem")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (rpush)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (rpush)")
 	})
 }
--- a/internal/command/server/config_test.go
+++ b/internal/command/server/config_test.go
@@ -3,8 +3,8 @@ package server
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestConfigParse(t *testing.T) {
@@ -38,11 +38,11 @@ func TestConfigParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseConfig, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.subcmd, test.want.subcmd)
+				be.Equal(t, cmd.subcmd, test.want.subcmd)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -50,14 +50,13 @@ func TestConfigParse(t *testing.T) {

 func TestConfigExec(t *testing.T) {
 	t.Run("config get", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseConfig, "config get *")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "2,databases,1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "2,databases,1")
 	})
 }
--- a/internal/command/server/dbsize_test.go
+++ b/internal/command/server/dbsize_test.go
@@ -3,8 +3,8 @@ package server
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestDBSizeParse(t *testing.T) {
@@ -25,9 +25,9 @@ func TestDBSizeParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseDBSize, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err != nil {
-				testx.AssertEqual(t, cmd, DBSize{})
+				be.Equal(t, cmd, DBSize{})
 			}
 		})
 	}
@@ -35,29 +35,26 @@ func TestDBSizeParse(t *testing.T) {

 func TestDBSizeExec(t *testing.T) {
 	t.Run("dbsize", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("age", 25)
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("age", 25)

 		cmd := redis.MustParse(ParseDBSize, "dbsize")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")
 	})

 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseDBSize, "dbsize")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/server/lolwut_test.go
+++ b/internal/command/server/lolwut_test.go
@@ -4,8 +4,8 @@ import (
 	"strings"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestLolwutParse(t *testing.T) {
@@ -30,9 +30,9 @@ func TestLolwutParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseLolwut, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err != nil {
-				testx.AssertEqual(t, cmd, Lolwut{})
+				be.Equal(t, cmd, Lolwut{})
 			}
 		})
 	}
@@ -40,24 +40,22 @@ func TestLolwutParse(t *testing.T) {

 func TestLolwutExec(t *testing.T) {
 	t.Run("lolwut", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLolwut, "lolwut you ok?")
 		conn := redis.NewFakeConn()
 		_, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(conn.Out()) >= 3, true)
+		be.Err(t, err, nil)
+		be.Equal(t, len(conn.Out()) >= 3, true)
 	})

 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseLolwut, "lolwut")
 		conn := redis.NewFakeConn()
 		_, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, strings.HasPrefix(conn.Out(), "Ask me a question"), true)
+		be.Err(t, err, nil)
+		be.Equal(t, strings.HasPrefix(conn.Out(), "Ask me a question"), true)
 	})
 }
--- a/internal/command/server/server_test.go
+++ b/internal/command/server/server_test.go
@@ -3,15 +3,12 @@ package server
 import (
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }
--- a/internal/command/set/sadd_test.go
+++ b/internal/command/set/sadd_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSAddParse(t *testing.T) {
@@ -44,12 +44,12 @@ func TestSAddParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSAdd, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.members, test.want.members)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.members, test.want.members)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -57,76 +57,71 @@ func TestSAddParse(t *testing.T) {

 func TestSAddExec(t *testing.T) {
 	t.Run("create single", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSAdd, "sadd key one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("key")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("key")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("create multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSAdd, "sadd key one two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("key")
+		items, _ := red.Set().Items("key")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("create/update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one")

 		cmd := redis.MustParse(ParseSAdd, "sadd key one two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("key")
+		items, _ := red.Set().Items("key")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("update multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two")

 		cmd := redis.MustParse(ParseSAdd, "sadd key one two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("key")
+		items, _ := red.Set().Items("key")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "value")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "value")

 		cmd := redis.MustParse(ParseSAdd, "sadd key one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (sadd)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (sadd)")
 	})
 }
--- a/internal/command/set/scard_test.go
+++ b/internal/command/set/scard_test.go
@@ -3,8 +3,8 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSCardParse(t *testing.T) {
@@ -33,11 +33,11 @@ func TestSCardParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSCard, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -45,51 +45,47 @@ func TestSCardParse(t *testing.T) {

 func TestSCardExec(t *testing.T) {
 	t.Run("card", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two")

 		cmd := redis.MustParse(ParseSCard, "scard key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one")
-		_, _ = db.Set().Delete("key", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one")
+		_, _ = red.Set().Delete("key", "one")

 		cmd := redis.MustParse(ParseSCard, "scard key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSCard, "scard key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "value")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "value")

 		cmd := redis.MustParse(ParseSCard, "scard key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/set/sdiff_test.go
+++ b/internal/command/set/sdiff_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSDiffParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSDiffParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSDiff, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.keys, test.want.keys)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,105 +46,97 @@ func TestSDiffParse(t *testing.T) {

 func TestSDiffExec(t *testing.T) {
 	t.Run("non-empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr", "fiv")
-		_, _ = db.Set().Add("key2", "two", "fou", "six")
-		_, _ = db.Set().Add("key3", "thr", "six")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr", "fiv")
+		_, _ = red.Set().Add("key2", "two", "fou", "six")
+		_, _ = red.Set().Add("key3", "thr", "six")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 2)
-		testx.AssertEqual(t, conn.Out(), "2,fiv,one")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 2)
+		be.Equal(t, conn.Out(), "2,fiv,one", "2,one,fiv")
 	})
 	t.Run("no keys", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 3)
-		testx.AssertEqual(t, conn.Out(), "3,one,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 3)
+		be.Equal(t, conn.Out(), "3,one,thr,two", "3,one,two,thr")
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("key2", "one", "fou")
-		_, _ = db.Set().Add("key3", "two", "fiv")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("key2", "one", "fou")
+		_, _ = red.Set().Add("key3", "two", "fiv")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("first not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key2", "two")
-		_, _ = db.Set().Add("key3", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key2", "two")
+		_, _ = red.Set().Add("key3", "thr")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("rest not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 1)
-		testx.AssertEqual(t, conn.Out(), "1,one")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 1)
+		be.Equal(t, conn.Out(), "1,one")
 	})
 	t.Run("all not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_ = db.Str().Set("key2", "two")
-		_, _ = db.Set().Add("key3", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_ = red.Str().Set("key2", "two")
+		_, _ = red.Set().Add("key3", "thr")

 		cmd := redis.MustParse(ParseSDiff, "sdiff key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 1)
-		testx.AssertEqual(t, conn.Out(), "1,one")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 1)
+		be.Equal(t, conn.Out(), "1,one")
 	})
 }
--- a/internal/command/set/sdiffstore_test.go
+++ b/internal/command/set/sdiffstore_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSDiffStoreParse(t *testing.T) {
@@ -39,12 +39,12 @@ func TestSDiffStoreParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSDiffStore, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.dest, test.want.dest)
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.dest, test.want.dest)
+				be.Equal(t, cmd.keys, test.want.keys)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -52,139 +52,131 @@ func TestSDiffStoreParse(t *testing.T) {

 func TestSDiffStoreExec(t *testing.T) {
 	t.Run("store", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr", "fiv")
-		_, _ = db.Set().Add("key2", "two", "fou", "six")
-		_, _ = db.Set().Add("key3", "thr", "six")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr", "fiv")
+		_, _ = red.Set().Add("key2", "two", "fou", "six")
+		_, _ = red.Set().Add("key3", "thr", "six")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("fiv"), core.Value("one")})
+		be.Equal(t, items, []core.Value{core.Value("fiv"), core.Value("one")})
 	})
 	t.Run("rewrite dest", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("first not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key2", "two")
-		_, _ = db.Set().Add("key3", "thr")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key2", "two")
+		_, _ = red.Set().Add("key3", "thr")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("rest not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("source key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
-		_ = db.Str().Set("key3", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")
+		_ = red.Str().Set("key3", "thr")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("dest key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
-		_ = db.Str().Set("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")
+		_ = red.Str().Set("dest", "old")

 		cmd := redis.MustParse(ParseSDiffStore, "sdiffstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (sdiffstore)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (sdiffstore)")

-		sval, _ := db.Str().Get("dest")
-		testx.AssertEqual(t, sval, core.Value("old"))
+		sval, _ := red.Str().Get("dest")
+		be.Equal(t, sval, core.Value("old"))
 	})
 }
--- a/internal/command/set/set_test.go
+++ b/internal/command/set/set_test.go
@@ -5,18 +5,15 @@ import (
 	"sort"
 	"testing"

-	"github.com/nalgeon/redka"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
+	"github.com/nalgeon/redka/internal/testx"
 )

-func getDB(tb testing.TB) (*redka.DB, redis.Redka) {
+func getRedka(tb testing.TB) redis.Redka {
 	tb.Helper()
-	db, err := redka.Open("file:/data.db?vfs=memdb", nil)
-	if err != nil {
-		tb.Fatal(err)
-	}
-	return db, redis.RedkaDB(db)
+	db := testx.OpenDB(tb)
+	return redis.RedkaDB(db)
 }

 func sortValues(vals []core.Value) {
--- a/internal/command/set/sinter_test.go
+++ b/internal/command/set/sinter_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSInterParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSInterParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSInter, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.keys, test.want.keys)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,92 +46,85 @@ func TestSInterParse(t *testing.T) {

 func TestSInterExec(t *testing.T) {
 	t.Run("non-empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
-		_, _ = db.Set().Add("key2", "two", "thr", "fou")
-		_, _ = db.Set().Add("key3", "one", "two", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")
+		_, _ = red.Set().Add("key2", "two", "thr", "fou")
+		_, _ = red.Set().Add("key3", "one", "two", "thr", "fou")

 		cmd := redis.MustParse(ParseSInter, "sinter key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 2)
-		testx.AssertEqual(t, conn.Out(), "2,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 2)
+		be.Equal(t, conn.Out(), "2,thr,two")
 	})
 	t.Run("no keys", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSInter, "sinter key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSInter, "sinter key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 3)
-		testx.AssertEqual(t, conn.Out(), "3,one,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 3)
+		be.Equal(t, conn.Out(), "3,one,thr,two")
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("key2", "two", "thr")
-		_, _ = db.Set().Add("key3", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("key2", "two", "thr")
+		_, _ = red.Set().Add("key3", "thr", "fou")

 		cmd := redis.MustParse(ParseSInter, "sinter key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")

 		cmd := redis.MustParse(ParseSInter, "sinter key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("all not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSInter, "sinter key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_ = db.Str().Set("key2", "one")
-		_, _ = db.Set().Add("key3", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_ = red.Str().Set("key2", "one")
+		_, _ = red.Set().Add("key3", "one")

 		cmd := redis.MustParse(ParseSInter, "sinter key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/set/sinterstore_test.go
+++ b/internal/command/set/sinterstore_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSInterStoreParse(t *testing.T) {
@@ -39,10 +39,10 @@ func TestSInterStoreParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSInterStore, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.dest, test.want.dest)
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.dest, test.want.dest)
+				be.Equal(t, cmd.keys, test.want.keys)
 			}
 		})
 	}
@@ -50,123 +50,116 @@ func TestSInterStoreParse(t *testing.T) {

 func TestSInterStoreExec(t *testing.T) {
 	t.Run("store", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
-		_, _ = db.Set().Add("key2", "two", "thr", "fou")
-		_, _ = db.Set().Add("key3", "one", "two", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")
+		_, _ = red.Set().Add("key2", "two", "thr", "fou")
+		_, _ = red.Set().Add("key3", "one", "two", "thr", "fou")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("thr"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("thr"), core.Value("two")})
 	})
 	t.Run("rewrite dest", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("source key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("source key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_ = db.Str().Set("key3", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_ = red.Str().Set("key3", "one")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("dest key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_ = db.Str().Set("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_ = red.Str().Set("dest", "old")

 		cmd := redis.MustParse(ParseSInterStore, "sinterstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (sinterstore)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (sinterstore)")

-		sval, _ := db.Str().Get("dest")
-		testx.AssertEqual(t, sval, core.Value("old"))
+		sval, _ := red.Str().Get("dest")
+		be.Equal(t, sval, core.Value("old"))
 	})
 }
--- a/internal/command/set/sismember_test.go
+++ b/internal/command/set/sismember_test.go
@@ -3,8 +3,8 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSIsMemberParse(t *testing.T) {
@@ -38,12 +38,12 @@ func TestSIsMemberParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSIsMember, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.member, test.want.member)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.member, test.want.member)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -51,50 +51,46 @@ func TestSIsMemberParse(t *testing.T) {

 func TestSIsMemberExec(t *testing.T) {
 	t.Run("elem found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one")

 		cmd := redis.MustParse(ParseSIsMember, "sismember key one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "1")
 	})
 	t.Run("elem not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one")

 		cmd := redis.MustParse(ParseSIsMember, "sismember key two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSIsMember, "sismember key one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "one")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "one")

 		cmd := redis.MustParse(ParseSIsMember, "sismember key one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, false)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, false)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/set/smembers_test.go
+++ b/internal/command/set/smembers_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSMembersParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSMembersParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSMembers, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,40 +46,35 @@ func TestSMembersParse(t *testing.T) {

 func TestSMembersExec(t *testing.T) {
 	t.Run("items", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSMembers, "smembers key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value{
-			core.Value("one"), core.Value("thr"), core.Value("two"),
-		})
-		testx.AssertEqual(t, conn.Out(), "3,one,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 3)
+		be.Equal(t, conn.Out(), "3,one,thr,two", "3,one,two,thr")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSMembers, "smembers key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "value")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "value")

 		cmd := redis.MustParse(ParseSMembers, "smembers key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, []core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res.([]core.Value), []core.Value(nil))
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/set/smove_test.go
+++ b/internal/command/set/smove_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSMoveParse(t *testing.T) {
@@ -39,13 +39,13 @@ func TestSMoveParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSMove, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.src, test.want.src)
-				testx.AssertEqual(t, cmd.dest, test.want.dest)
-				testx.AssertEqual(t, cmd.member, test.want.member)
+				be.Equal(t, cmd.src, test.want.src)
+				be.Equal(t, cmd.dest, test.want.dest)
+				be.Equal(t, cmd.member, test.want.member)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -53,109 +53,103 @@ func TestSMoveParse(t *testing.T) {

 func TestSMoveExec(t *testing.T) {
 	t.Run("move", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("src", "one", "two")
-		_, _ = db.Set().Add("dest", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("src", "one", "two")
+		_, _ = red.Set().Add("dest", "thr", "fou")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, false)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, true)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, false)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, true)
 	})
 	t.Run("dest not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("src", "one", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("src", "one", "two")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, false)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, true)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, false)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, true)
 	})
 	t.Run("src elem not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("src", "two")
-		_, _ = db.Set().Add("dest", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("src", "two")
+		_, _ = red.Set().Add("dest", "thr", "fou")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, false)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, false)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, false)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, false)
 	})
 	t.Run("src key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("dest", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("dest", "thr", "fou")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, false)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, false)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, false)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, false)
 	})
 	t.Run("dest type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("src", "one", "two")
-		_ = db.Str().Set("dest", "str")
+		red := getRedka(t)
+		_, _ = red.Set().Add("src", "one", "two")
+		_ = red.Str().Set("dest", "str")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (smove)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (smove)")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, true)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, false)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, true)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, false)
 	})
 	t.Run("src type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("src", "one")
-		_, _ = db.Set().Add("dest", "thr", "fou")
+		red := getRedka(t)
+		_ = red.Str().Set("src", "one")
+		_, _ = red.Set().Add("dest", "thr", "fou")

 		cmd := redis.MustParse(ParseSMove, "smove src dest one")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		sone, _ := db.Set().Exists("src", "one")
-		testx.AssertEqual(t, sone, false)
-		done, _ := db.Set().Exists("dest", "one")
-		testx.AssertEqual(t, done, false)
+		sone, _ := red.Set().Exists("src", "one")
+		be.Equal(t, sone, false)
+		done, _ := red.Set().Exists("dest", "one")
+		be.Equal(t, done, false)
 	})
 }
--- a/internal/command/set/spop_test.go
+++ b/internal/command/set/spop_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSPopParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSPopParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSPop, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,43 +46,40 @@ func TestSPopParse(t *testing.T) {

 func TestSPopExec(t *testing.T) {
 	t.Run("pop", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSPop, "spop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)
 		s := res.(core.Value).String()
-		testx.AssertEqual(t, s == "one" || s == "two" || s == "thr", true)
+		be.Equal(t, s == "one" || s == "two" || s == "thr", true)
 		s = conn.Out()
-		testx.AssertEqual(t, s == "one" || s == "two" || s == "thr", true)
+		be.Equal(t, s == "one" || s == "two" || s == "thr", true)

-		slen, _ := db.Set().Len("key")
-		testx.AssertEqual(t, slen, 2)
+		slen, _ := red.Set().Len("key")
+		be.Equal(t, slen, 2)
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSPop, "spop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "value")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "value")

 		cmd := redis.MustParse(ParseSPop, "spop key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/set/srandmember_test.go
+++ b/internal/command/set/srandmember_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSRandMemberParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSRandMemberParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSRandMember, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.key, test.want.key)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,40 +46,37 @@ func TestSRandMemberParse(t *testing.T) {

 func TestSRandMemberExec(t *testing.T) {
 	t.Run("random", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSRandMember, "srandmember key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)
 		s := res.(core.Value).String()
-		testx.AssertEqual(t, s == "one" || s == "two" || s == "thr", true)
+		be.Equal(t, s == "one" || s == "two" || s == "thr", true)
 		s = conn.Out()
-		testx.AssertEqual(t, s == "one" || s == "two" || s == "thr", true)
+		be.Equal(t, s == "one" || s == "two" || s == "thr", true)
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSRandMember, "srandmember key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "value")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "value")

 		cmd := redis.MustParse(ParseSRandMember, "srandmember key")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")
 	})
 }
--- a/internal/command/set/srem_test.go
+++ b/internal/command/set/srem_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSRemParse(t *testing.T) {
@@ -44,12 +44,12 @@ func TestSRemParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSRem, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.members, test.want.members)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.members, test.want.members)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -57,56 +57,52 @@ func TestSRemParse(t *testing.T) {

 func TestSRemExec(t *testing.T) {
 	t.Run("some", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSRem, "srem key one thr")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("key")
-		testx.AssertEqual(t, items, []core.Value{core.Value("two")})
+		items, _ := red.Set().Items("key")
+		be.Equal(t, items, []core.Value{core.Value("two")})
 	})
 	t.Run("none", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSRem, "srem key fou fiv")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		slen, _ := db.Set().Len("key")
-		testx.AssertEqual(t, slen, 3)
+		slen, _ := red.Set().Len("key")
+		be.Equal(t, slen, 3)
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSRem, "srem key one two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("key", "str")
+		red := getRedka(t)
+		_ = red.Str().Set("key", "str")

 		cmd := redis.MustParse(ParseSRem, "srem key one two")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 }
--- a/internal/command/set/sscan_test.go
+++ b/internal/command/set/sscan_test.go
@@ -1,12 +1,13 @@
 package set

 import (
+	"fmt"
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
 	"github.com/nalgeon/redka/internal/rset"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSScanParse(t *testing.T) {
@@ -103,50 +104,53 @@ func TestSScanParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSScan, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.key)
-				testx.AssertEqual(t, cmd.cursor, test.cursor)
-				testx.AssertEqual(t, cmd.match, test.match)
-				testx.AssertEqual(t, cmd.count, test.count)
+				be.Equal(t, cmd.key, test.key)
+				be.Equal(t, cmd.cursor, test.cursor)
+				be.Equal(t, cmd.match, test.match)
+				be.Equal(t, cmd.count, test.count)
 			} else {
-				testx.AssertEqual(t, cmd, SScan{})
+				be.Equal(t, cmd, SScan{})
 			}
 		})
 	}
 }

 func TestSScanExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
-	_, _ = db.Set().Add("key", "m11", "m12", "m21", "m22", "m31")
+	red := getRedka(t)
+	_, _ = red.Set().Add("key", "m11", "m12", "m21", "m22", "m31")

 	t.Run("sscan all", func(t *testing.T) {
+		var cursor int
 		{
 			cmd := redis.MustParse(ParseSScan, "sscan key 0")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Items), 5)
-			testx.AssertEqual(t, sres.Items[0], core.Value("m11"))
-			testx.AssertEqual(t, sres.Items[4], core.Value("m31"))
-			testx.AssertEqual(t, conn.Out(), "2,5,5,m11,m12,m21,m22,m31")
+			be.True(t, sres.Cursor > 0)
+			be.Equal(t, len(sres.Items), 5)
+			be.Equal(t, sres.Items[0], core.Value("m11"))
+			be.Equal(t, sres.Items[4], core.Value("m31"))
+			wantOut := fmt.Sprintf("2,%d,5,m11,m12,m21,m22,m31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
-			cmd := redis.MustParse(ParseSScan, "sscan key 5")
+			next := fmt.Sprintf("sscan key %d", cursor)
+			cmd := redis.MustParse(ParseSScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Items), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Items), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})
 	t.Run("sscan pattern", func(t *testing.T) {
@@ -154,72 +158,83 @@ func TestSScanExec(t *testing.T) {
 		conn := redis.NewFakeConn()

 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
+		be.Err(t, err, nil)

 		sres := res.(rset.ScanResult)
-		testx.AssertEqual(t, sres.Cursor, 4)
-		testx.AssertEqual(t, len(sres.Items), 2)
-		testx.AssertEqual(t, sres.Items[0].String(), "m21")
-		testx.AssertEqual(t, sres.Items[1].String(), "m22")
-		testx.AssertEqual(t, conn.Out(), "2,4,2,m21,m22")
+		be.True(t, sres.Cursor > 0)
+		be.Equal(t, len(sres.Items), 2)
+		be.Equal(t, sres.Items[0].String(), "m21")
+		be.Equal(t, sres.Items[1].String(), "m22")
+		wantOut := fmt.Sprintf("2,%d,2,m21,m22", sres.Cursor)
+		be.Equal(t, conn.Out(), wantOut)
 	})
 	t.Run("sscan count", func(t *testing.T) {
+		var cursor int
 		{
 			// page 1
 			cmd := redis.MustParse(ParseSScan, "sscan key 0 match * count 2")
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 2)
-			testx.AssertEqual(t, len(sres.Items), 2)
-			testx.AssertEqual(t, sres.Items[0].String(), "m11")
-			testx.AssertEqual(t, sres.Items[1].String(), "m12")
-			testx.AssertEqual(t, conn.Out(), "2,2,2,m11,m12")
+			be.True(t, sres.Cursor > 0)
+			be.Equal(t, len(sres.Items), 2)
+			be.Equal(t, sres.Items[0].String(), "m11")
+			be.Equal(t, sres.Items[1].String(), "m12")
+			wantOut := fmt.Sprintf("2,%d,2,m11,m12", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 2
-			cmd := redis.MustParse(ParseSScan, "sscan key 2 match * count 2")
+			next := fmt.Sprintf("sscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseSScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 4)
-			testx.AssertEqual(t, len(sres.Items), 2)
-			testx.AssertEqual(t, sres.Items[0].String(), "m21")
-			testx.AssertEqual(t, sres.Items[1].String(), "m22")
-			testx.AssertEqual(t, conn.Out(), "2,4,2,m21,m22")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Items), 2)
+			be.Equal(t, sres.Items[0].String(), "m21")
+			be.Equal(t, sres.Items[1].String(), "m22")
+			wantOut := fmt.Sprintf("2,%d,2,m21,m22", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// page 3
-			cmd := redis.MustParse(ParseSScan, "sscan key 4 match * count 2")
+			next := fmt.Sprintf("sscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseSScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 5)
-			testx.AssertEqual(t, len(sres.Items), 1)
-			testx.AssertEqual(t, sres.Items[0].String(), "m31")
-			testx.AssertEqual(t, conn.Out(), "2,5,1,m31")
+			be.True(t, sres.Cursor > cursor)
+			be.Equal(t, len(sres.Items), 1)
+			be.Equal(t, sres.Items[0].String(), "m31")
+			wantOut := fmt.Sprintf("2,%d,1,m31", sres.Cursor)
+			be.Equal(t, conn.Out(), wantOut)
+			cursor = sres.Cursor
 		}
 		{
 			// no more pages
-			cmd := redis.MustParse(ParseSScan, "sscan key 5 match * count 2")
+			next := fmt.Sprintf("sscan key %d match * count 2", cursor)
+			cmd := redis.MustParse(ParseSScan, next)
 			conn := redis.NewFakeConn()

 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
+			be.Err(t, err, nil)

 			sres := res.(rset.ScanResult)
-			testx.AssertEqual(t, sres.Cursor, 0)
-			testx.AssertEqual(t, len(sres.Items), 0)
-			testx.AssertEqual(t, conn.Out(), "2,0,0")
+			be.Equal(t, sres.Cursor, 0)
+			be.Equal(t, len(sres.Items), 0)
+			be.Equal(t, conn.Out(), "2,0,0")
 		}
 	})
 }
--- a/internal/command/set/sunion_test.go
+++ b/internal/command/set/sunion_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSUnionParse(t *testing.T) {
@@ -34,11 +34,11 @@ func TestSUnionParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSUnion, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.keys, test.want.keys)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -46,78 +46,72 @@ func TestSUnionParse(t *testing.T) {

 func TestSUnionExec(t *testing.T) {
 	t.Run("non-empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("key2", "two", "thr")
-		_, _ = db.Set().Add("key3", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("key2", "two", "thr")
+		_, _ = red.Set().Add("key3", "thr", "fou")

 		cmd := redis.MustParse(ParseSUnion, "sunion key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 4)
-		testx.AssertEqual(t, conn.Out(), "4,fou,one,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 4)
+		be.Equal(t, conn.Out(), "4,fou,one,thr,two")
 	})
 	t.Run("no keys", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSUnion, "sunion key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")

 		cmd := redis.MustParse(ParseSUnion, "sunion key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 3)
-		testx.AssertEqual(t, conn.Out(), "3,one,thr,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 3)
+		be.Equal(t, conn.Out(), "3,one,thr,two")
 	})
 	t.Run("key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "two")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "two")

 		cmd := redis.MustParse(ParseSUnion, "sunion key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 2)
-		testx.AssertEqual(t, conn.Out(), "2,one,two")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 2)
+		be.Equal(t, conn.Out(), "2,one,two")
 	})
 	t.Run("all not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseSUnion, "sunion key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 0)
+		be.Equal(t, conn.Out(), "0")
 	})
 	t.Run("key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_ = db.Str().Set("key2", "two")
-		_, _ = db.Set().Add("key3", "thr")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_ = red.Str().Set("key2", "two")
+		_, _ = red.Set().Add("key3", "thr")

 		cmd := redis.MustParse(ParseSUnion, "sunion key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, len(res.([]core.Value)), 2)
-		testx.AssertEqual(t, conn.Out(), "2,one,thr")
+		be.Err(t, err, nil)
+		be.Equal(t, len(res.([]core.Value)), 2)
+		be.Equal(t, conn.Out(), "2,one,thr")
 	})
 }
--- a/internal/command/set/sunionstore_test.go
+++ b/internal/command/set/sunionstore_test.go
@@ -3,9 +3,9 @@ package set
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSUnionStoreParse(t *testing.T) {
@@ -39,12 +39,12 @@ func TestSUnionStoreParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSUnionStore, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.dest, test.want.dest)
-				testx.AssertEqual(t, cmd.keys, test.want.keys)
+				be.Equal(t, cmd.dest, test.want.dest)
+				be.Equal(t, cmd.keys, test.want.keys)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -52,123 +52,116 @@ func TestSUnionStoreParse(t *testing.T) {

 func TestSUnionStoreExec(t *testing.T) {
 	t.Run("store", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two", "thr")
-		_, _ = db.Set().Add("key2", "two", "thr", "fou")
-		_, _ = db.Set().Add("key3", "one", "two", "thr", "fou")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two", "thr")
+		_, _ = red.Set().Add("key2", "two", "thr", "fou")
+		_, _ = red.Set().Add("key3", "one", "two", "thr", "fou")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 4)
-		testx.AssertEqual(t, conn.Out(), "4")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 4)
+		be.Equal(t, conn.Out(), "4")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{
+		be.Equal(t, items, []core.Value{
 			core.Value("fou"), core.Value("one"), core.Value("thr"), core.Value("two"),
 		})
 	})
 	t.Run("rewrite dest", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("single key", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one", "two")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one", "two")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 2)
-		testx.AssertEqual(t, conn.Out(), "2")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 2)
+		be.Equal(t, conn.Out(), "2")

-		items, _ := db.Set().Items("dest")
+		items, _ := red.Set().Items("dest")
 		sortValues(items)
-		testx.AssertEqual(t, items, []core.Value{core.Value("one"), core.Value("two")})
+		be.Equal(t, items, []core.Value{core.Value("one"), core.Value("two")})
 	})
 	t.Run("empty", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 0)
-		testx.AssertEqual(t, conn.Out(), "0")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 0)
+		be.Equal(t, conn.Out(), "0")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value(nil))
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value(nil))
 	})
 	t.Run("source key not found", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_, _ = db.Set().Add("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_, _ = red.Set().Add("dest", "old")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("source key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_ = db.Str().Set("key3", "one")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_ = red.Str().Set("key3", "one")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2 key3")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		items, _ := db.Set().Items("dest")
-		testx.AssertEqual(t, items, []core.Value{core.Value("one")})
+		items, _ := red.Set().Items("dest")
+		be.Equal(t, items, []core.Value{core.Value("one")})
 	})
 	t.Run("dest key type mismatch", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_, _ = db.Set().Add("key1", "one")
-		_, _ = db.Set().Add("key2", "one")
-		_ = db.Str().Set("dest", "old")
+		red := getRedka(t)
+		_, _ = red.Set().Add("key1", "one")
+		_, _ = red.Set().Add("key2", "one")
+		_ = red.Str().Set("dest", "old")

 		cmd := redis.MustParse(ParseSUnionStore, "sunionstore dest key1 key2")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertErr(t, err, core.ErrKeyType)
-		testx.AssertEqual(t, res, nil)
-		testx.AssertEqual(t, conn.Out(), core.ErrKeyType.Error()+" (sunionstore)")
+		be.Err(t, err, core.ErrKeyType)
+		be.Equal(t, res, nil)
+		be.Equal(t, conn.Out(), core.ErrKeyType.Error()+" (sunionstore)")

-		sval, _ := db.Str().Get("dest")
-		testx.AssertEqual(t, sval, core.Value("old"))
+		sval, _ := red.Str().Get("dest")
+		be.Equal(t, sval, core.Value("old"))
 	})
 }
--- a/internal/command/string/decr_test.go
+++ b/internal/command/string/decr_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestDecrParse(t *testing.T) {
@@ -37,12 +37,12 @@ func TestDecrParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.delta, test.want.delta)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.delta, test.want.delta)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -54,33 +54,31 @@ func TestDecrExec(t *testing.T) {
 	}

 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(parse, "decr age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, -1)
-		testx.AssertEqual(t, conn.Out(), "-1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, -1)
+		be.Equal(t, conn.Out(), "-1")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), -1)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), -1)
 	})

 	t.Run("decr", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("age", "25")
+		red := getRedka(t)
+		_ = red.Str().Set("age", "25")

 		cmd := redis.MustParse(parse, "decr age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 24)
-		testx.AssertEqual(t, conn.Out(), "24")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 24)
+		be.Equal(t, conn.Out(), "24")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 24)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 24)
 	})
 }
--- a/internal/command/string/decrby_test.go
+++ b/internal/command/string/decrby_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestDecrByParse(t *testing.T) {
@@ -37,12 +37,12 @@ func TestDecrByParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.delta, test.want.delta)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.delta, test.want.delta)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -54,33 +54,31 @@ func TestDecrByExec(t *testing.T) {
 	}

 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(parse, "decrby age 12")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, -12)
-		testx.AssertEqual(t, conn.Out(), "-12")
+		be.Err(t, err, nil)
+		be.Equal(t, res, -12)
+		be.Equal(t, conn.Out(), "-12")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), -12)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), -12)
 	})

 	t.Run("decrby", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("age", "25")
+		red := getRedka(t)
+		_ = red.Str().Set("age", "25")

 		cmd := redis.MustParse(parse, "decrby age 12")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 13)
-		testx.AssertEqual(t, conn.Out(), "13")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 13)
+		be.Equal(t, conn.Out(), "13")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 13)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 13)
 	})
 }
--- a/internal/command/string/get_test.go
+++ b/internal/command/string/get_test.go
@@ -3,9 +3,9 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestGetParse(t *testing.T) {
@@ -34,21 +34,19 @@ func TestGetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseGet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want)
+				be.Equal(t, cmd.key, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, Get{})
+				be.Equal(t, cmd, Get{})
 			}
 		})
 	}
 }

 func TestGetExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
-
-	_ = db.Str().Set("name", "alice")
+	red := getRedka(t)
+	_ = red.Str().Set("name", "alice")

 	tests := []struct {
 		cmd string
@@ -72,9 +70,9 @@ func TestGetExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseGet, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/string/getset_test.go
+++ b/internal/command/string/getset_test.go
@@ -3,9 +3,9 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestGetSetParse(t *testing.T) {
@@ -39,12 +39,12 @@ func TestGetSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseGetSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.value, test.want.value)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.value, test.want.value)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -52,34 +52,31 @@ func TestGetSetParse(t *testing.T) {

 func TestGetSetExec(t *testing.T) {
 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseGetSet, "getset name alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value(nil))
-		testx.AssertEqual(t, conn.Out(), "(nil)")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value(nil))
+		be.Equal(t, conn.Out(), "(nil)")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseGetSet, "getset name bob")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, core.Value("alice"))
-		testx.AssertEqual(t, conn.Out(), "alice")
+		be.Err(t, err, nil)
+		be.Equal(t, res.(core.Value), core.Value("alice"))
+		be.Equal(t, conn.Out(), "alice")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "bob")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "bob")
 	})
 }
--- a/internal/command/string/incr_test.go
+++ b/internal/command/string/incr_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestIncrParse(t *testing.T) {
@@ -37,12 +37,12 @@ func TestIncrParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.delta, test.want.delta)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.delta, test.want.delta)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -54,33 +54,31 @@ func TestIncrExec(t *testing.T) {
 	}

 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(parse, "incr age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 1)
-		testx.AssertEqual(t, conn.Out(), "1")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 1)
+		be.Equal(t, conn.Out(), "1")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 1)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 1)
 	})

 	t.Run("incr", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("age", "25")
+		red := getRedka(t)
+		_ = red.Str().Set("age", "25")

 		cmd := redis.MustParse(parse, "incr age")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 26)
-		testx.AssertEqual(t, conn.Out(), "26")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 26)
+		be.Equal(t, conn.Out(), "26")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 26)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 26)
 	})
 }
--- a/internal/command/string/incrby_test.go
+++ b/internal/command/string/incrby_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestIncrByParse(t *testing.T) {
@@ -37,12 +37,12 @@ func TestIncrByParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.delta, test.want.delta)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.delta, test.want.delta)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -54,33 +54,31 @@ func TestIncrByExec(t *testing.T) {
 	}

 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(parse, "incrby age 42")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 42)
-		testx.AssertEqual(t, conn.Out(), "42")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 42)
+		be.Equal(t, conn.Out(), "42")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 42)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 42)
 	})

 	t.Run("incrby", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-		_ = db.Str().Set("age", "25")
+		red := getRedka(t)
+		_ = red.Str().Set("age", "25")

 		cmd := redis.MustParse(parse, "incrby age 42")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, 67)
-		testx.AssertEqual(t, conn.Out(), "67")
+		be.Err(t, err, nil)
+		be.Equal(t, res, 67)
+		be.Equal(t, conn.Out(), "67")

-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.MustInt(), 67)
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.MustInt(), 67)
 	})
 }
--- a/internal/command/string/incrbyfloat_test.go
+++ b/internal/command/string/incrbyfloat_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestIncrByFloatParse(t *testing.T) {
@@ -43,20 +43,19 @@ func TestIncrByFloatParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseIncrByFloat, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.delta, test.want.delta)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.delta, test.want.delta)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
 }

 func TestIncrByFloatExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

 	tests := []struct {
 		cmd string
@@ -87,15 +86,14 @@ func TestIncrByFloatExec(t *testing.T) {

 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
-			_ = db.Str().Set("age", 25)
+			_ = red.Str().Set("age", 25)

 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseIncrByFloat, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
-
 }
--- a/internal/command/string/mget_test.go
+++ b/internal/command/string/mget_test.go
@@ -3,9 +3,9 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestMGetParse(t *testing.T) {
@@ -34,22 +34,21 @@ func TestMGetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseMGet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.keys, test.want)
+				be.Equal(t, cmd.keys, test.want)
 			} else {
-				testx.AssertEqual(t, cmd, MGet{})
+				be.Equal(t, cmd, MGet{})
 			}
 		})
 	}
 }

 func TestMGetExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

-	_ = db.Str().Set("name", "alice")
-	_ = db.Str().Set("age", 25)
+	_ = red.Str().Set("name", "alice")
+	_ = red.Str().Set("age", 25)

 	tests := []struct {
 		cmd string
@@ -83,9 +82,9 @@ func TestMGetExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseMGet, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/internal/command/string/mset_test.go
+++ b/internal/command/string/mset_test.go
@@ -3,8 +3,8 @@ package string
 import (
 	"testing"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestMSetParse(t *testing.T) {
@@ -46,11 +46,11 @@ func TestMSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseMSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.items, test.want.items)
+				be.Equal(t, cmd.items, test.want.items)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -58,73 +58,69 @@ func TestMSetParse(t *testing.T) {

 func TestMSetExec(t *testing.T) {
 	t.Run("create single", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseMSet, "mset name alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("create multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(ParseMSet, "mset name alice age 25")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "alice")
-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.String(), "25")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "alice")
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.String(), "25")
 	})

 	t.Run("create/update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("name", "alice")
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(ParseMSet, "mset name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.String(), "50")
 	})

 	t.Run("update multiple", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

-		_ = db.Str().Set("name", "alice")
-		_ = db.Str().Set("age", 25)
+		_ = red.Str().Set("name", "alice")
+		_ = red.Str().Set("age", 25)

 		cmd := redis.MustParse(ParseMSet, "mset name bob age 50")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "bob")
-		age, _ := db.Str().Get("age")
-		testx.AssertEqual(t, age.String(), "50")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "bob")
+		age, _ := red.Str().Get("age")
+		be.Equal(t, age.String(), "50")
 	})
 }
--- a/internal/command/string/psetex_test.go
+++ b/internal/command/string/psetex_test.go
@@ -4,8 +4,8 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestPSetEXParse(t *testing.T) {
@@ -48,13 +48,13 @@ func TestPSetEXParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(parse, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.value, test.want.value)
-				testx.AssertEqual(t, cmd.ttl, test.want.ttl)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.value, test.want.value)
+				be.Equal(t, cmd.ttl, test.want.ttl)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
@@ -66,64 +66,59 @@ func TestPSetEXExec(t *testing.T) {
 	}

 	t.Run("create", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
+		red := getRedka(t)

 		cmd := redis.MustParse(parse, "psetex name 60000 alice")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

 		expireAt := time.Now().Add(60 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "alice")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "alice")
 	})

 	t.Run("update", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().Set("name", "alice")
+		red := getRedka(t)
+		_ = red.Str().Set("name", "alice")

 		cmd := redis.MustParse(parse, "psetex name 60000 bob")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

 		expireAt := time.Now().Add(60 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "bob")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "bob")
 	})

 	t.Run("change ttl", func(t *testing.T) {
-		db, red := getDB(t)
-		defer db.Close()
-
-		_ = db.Str().SetExpires("name", "alice", 60*time.Second)
+		red := getRedka(t)
+		_ = red.Str().SetExpires("name", "alice", 60*time.Second)

 		cmd := redis.MustParse(parse, "psetex name 10000 bob")
 		conn := redis.NewFakeConn()
 		res, err := cmd.Run(conn, red)
-		testx.AssertNoErr(t, err)
-		testx.AssertEqual(t, res, true)
-		testx.AssertEqual(t, conn.Out(), "OK")
+		be.Err(t, err, nil)
+		be.Equal(t, res, true)
+		be.Equal(t, conn.Out(), "OK")

 		expireAt := time.Now().Add(10 * time.Second)
-		key, _ := db.Key().Get("name")
-		testx.AssertEqual(t, *key.ETime/1000, expireAt.UnixMilli()/1000)
+		key, _ := red.Key().Get("name")
+		be.Equal(t, *key.ETime/1000, expireAt.UnixMilli()/1000)

-		name, _ := db.Str().Get("name")
-		testx.AssertEqual(t, name.String(), "bob")
+		name, _ := red.Str().Get("name")
+		be.Equal(t, name.String(), "bob")
 	})

 }
--- a/internal/command/string/set_test.go
+++ b/internal/command/string/set_test.go
@@ -4,9 +4,9 @@ import (
 	"testing"
 	"time"

+	"github.com/nalgeon/be"
 	"github.com/nalgeon/redka/internal/core"
 	"github.com/nalgeon/redka/internal/redis"
-	"github.com/nalgeon/redka/internal/testx"
 )

 func TestSetParse(t *testing.T) {
@@ -123,23 +123,22 @@ func TestSetParse(t *testing.T) {
 	for _, test := range tests {
 		t.Run(test.cmd, func(t *testing.T) {
 			cmd, err := redis.Parse(ParseSet, test.cmd)
-			testx.AssertEqual(t, err, test.err)
+			be.Equal(t, err, test.err)
 			if err == nil {
-				testx.AssertEqual(t, cmd.key, test.want.key)
-				testx.AssertEqual(t, cmd.value, test.want.value)
-				testx.AssertEqual(t, cmd.ifNX, test.want.ifNX)
-				testx.AssertEqual(t, cmd.ifXX, test.want.ifXX)
-				testx.AssertEqual(t, cmd.ttl, test.want.ttl)
+				be.Equal(t, cmd.key, test.want.key)
+				be.Equal(t, cmd.value, test.want.value)
+				be.Equal(t, cmd.ifNX, test.want.ifNX)
+				be.Equal(t, cmd.ifXX, test.want.ifXX)
+				be.Equal(t, cmd.ttl, test.want.ttl)
 			} else {
-				testx.AssertEqual(t, cmd, test.want)
+				be.Equal(t, cmd, test.want)
 			}
 		})
 	}
 }

 func TestSetExec(t *testing.T) {
-	db, red := getDB(t)
-	defer db.Close()
+	red := getRedka(t)

 	tests := []struct {
 		cmd string
@@ -203,9 +202,9 @@ func TestSetExec(t *testing.T) {
 			conn := redis.NewFakeConn()
 			cmd := redis.MustParse(ParseSet, test.cmd)
 			res, err := cmd.Run(conn, red)
-			testx.AssertNoErr(t, err)
-			testx.AssertEqual(t, res, test.res)
-			testx.AssertEqual(t, conn.Out(), test.out)
+			be.Err(t, err, nil)
+			be.Equal(t, res, test.res)
+			be.Equal(t, conn.Out(), test.out)
 		})
 	}
 }
--- a/Show More
+++ b/Show More