Fix GC deleting values without expiry (#54)

* Test MYSQL Fix

* Test

* Add postgres

* Fix mysql

* Fix sqlite

sqlite3/sqlite3_test.go

@@ -1,6 +1,7 @@
 package sqlite3
 
 import (
+	"database/sql"
 	"testing"
 	"time"
 
@@ -119,6 +120,31 @@ func Test_SQLite3_Reset(t *testing.T) {
 	utils.AssertEqual(t, true, len(result) == 0)
 }
 
+func Test_SQLite3_GC(t *testing.T) {
+	var (
+		testVal = []byte("doe")
+	)
+
+	// This key should expire
+	err := testStore.Set("john", testVal, time.Nanosecond)
+	utils.AssertEqual(t, nil, err)
+
+	testStore.gc(time.Now())
+	row := testStore.db.QueryRow(testStore.sqlSelect, "john")
+	err = row.Scan(nil, nil)
+	utils.AssertEqual(t, sql.ErrNoRows, err)
+
+	// This key should not expire
+	err = testStore.Set("john", testVal, 0)
+	utils.AssertEqual(t, nil, err)
+
+	testStore.gc(time.Now())
+	val, err := testStore.Get("john")
+	utils.AssertEqual(t, nil, err)
+	utils.AssertEqual(t, testVal, val)
+
+}
+
 func Test_SQLite3_Close(t *testing.T) {
 	utils.AssertEqual(t, nil, testStore.Close())
 }