diff --git a/lib/files/files.go b/lib/files/files.go
index d469ae2..d51db87 100644
--- a/lib/files/files.go
+++ b/lib/files/files.go
@@ -7,7 +7,6 @@ import (
 
 func CheckNotExist(src string) bool {
 	_, err := os.Stat(src)
-
 	return os.IsNotExist(err)
 }
 
diff --git a/lib/idgenerator/snowflake_test.go b/lib/idgenerator/snowflake_test.go
index 727319e..9042101 100644
--- a/lib/idgenerator/snowflake_test.go
+++ b/lib/idgenerator/snowflake_test.go
@@ -5,7 +5,7 @@ import "testing"
 func TestMGenerator(t *testing.T) {
 	gen := MakeGenerator("a")
 	ids := make(map[int64]struct{})
-	size := int(maxSequence) - 1
+	size := int(1e6)
 	for i := 0; i < size; i++ {
 		id := gen.NextId()
 		_, ok := ids[id]
diff --git a/redis/client/client.go b/redis/client/client.go
index 6e30a10..5b538b2 100644
--- a/redis/client/client.go
+++ b/redis/client/client.go
@@ -134,6 +134,7 @@ func (client *Client) doHeartbeat() {
 	request := &Request{
 		args:      [][]byte{[]byte("PING")},
 		heartbeat: true,
+		waiting:   &wait.Wait{},
 	}
 	request.waiting.Add(1)
 	client.working.Add(1)
diff --git a/redis/client/client_test.go b/redis/client/client_test.go
index 500a82b..61bba97 100644
--- a/redis/client/client_test.go
+++ b/redis/client/client_test.go
@@ -60,6 +60,7 @@ func TestClient(t *testing.T) {
 		}
 	}
 
+	client.doHeartbeat() // random do heartbeat
 	result = client.Send([][]byte{
 		[]byte("GET"),
 		[]byte("a"),