diff --git a/commands/generate.go b/commands/generate.go
index 1daa99f..7c2699c 100644
--- a/commands/generate.go
+++ b/commands/generate.go
@@ -35,7 +35,7 @@ func GenerateCmd() *cobra.Command {
 func generateCmdF(cmd *cobra.Command, args []string) {
 	dir, _ := cmd.Flags().GetString("dir")
 	driver, _ := cmd.Flags().GetString("driver")
-	extention := getExtension(driver)
+	extension := getExtension(driver)
 	fileName := args[0]
 
 	if ts, _ := cmd.Flags().GetBool("timestamp"); ts {
@@ -57,7 +57,7 @@ func generateCmdF(cmd *cobra.Command, args []string) {
 			fileName = strings.Join([]string{date.Format(tf), fileName}, "_")
 		}
 	} else if seq, _ := cmd.Flags().GetBool("sequence"); seq {
-		next, err := sequelNumber(dir, extention)
+		next, err := sequelNumber(dir, extension, driver)
 		if err != nil {
 			cmd.PrintErrln(err)
 			return
@@ -80,7 +80,7 @@ func generateCmdF(cmd *cobra.Command, args []string) {
 
 	migrations := []string{"down", "up"}
 	for _, migration := range migrations {
-		filePath := strings.Join([]string{filepath.Join(dir, fileName), migration, extention}, ".")
+		filePath := strings.Join([]string{filepath.Join(dir, fileName), migration, extension}, ".")
 		f, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
 		if err != nil {
 			cmd.PrintErrln(err)
@@ -90,8 +90,8 @@ func generateCmdF(cmd *cobra.Command, args []string) {
 	}
 }
 
-func sequelNumber(dir, extention string) (int, error) {
-	matches, err := filepath.Glob(filepath.Join(dir, "*"+extention))
+func sequelNumber(dir, extension, driver string) (int, error) {
+	matches, err := filepath.Glob(filepath.Join(dir, driver, "*"+extension))
 	if err != nil {
 		return 0, err
 	}
@@ -119,7 +119,7 @@ func sequelNumber(dir, extention string) (int, error) {
 
 func getExtension(driver string) string {
 	switch driver {
-	case "postgresql", "mysql":
+	case "postgres", "mysql":
 		return "sql"
 	default:
 		return "txt"
diff --git a/commands/generate_test.go b/commands/generate_test.go
new file mode 100644
index 0000000..3373370
--- /dev/null
+++ b/commands/generate_test.go
@@ -0,0 +1,97 @@
+package commands
+
+import (
+	"errors"
+	"log"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/go-morph/morph/commands/testlib"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGenerateCMD(t *testing.T) {
+	dir := "./tmp"
+	cmd := GenerateCmd()
+	cmd.PersistentFlags().String("dir", ".", "the migrations directory")
+
+	t.Run("should generate migration files correctly when using --sequence", func(t *testing.T) {
+		name := "create_saiyans"
+
+		defer func() {
+			err := os.RemoveAll(dir)
+			if err != nil {
+				log.Fatal(err)
+			}
+		}()
+
+		// ensure that directory doesn't exist
+		_, err := os.Stat("./tmp")
+		require.Equal(t, errors.Is(err, os.ErrNotExist), true)
+
+		cases := []struct {
+			driver   string
+			args     []string
+			sequence string
+		}{
+			{
+				driver:   "postgres",
+				args:     []string{name, "--dir", dir, "--sequence"},
+				sequence: "000001",
+			},
+			{
+				driver:   "mysql",
+				args:     []string{name, "--dir", dir, "--sequence"},
+				sequence: "000001",
+			},
+			{
+				driver:   "postgres",
+				args:     []string{name, "--dir", dir, "--sequence"},
+				sequence: "000002",
+			},
+			{
+				driver:   "mysql",
+				args:     []string{name, "--dir", dir, "--sequence"},
+				sequence: "000002",
+			},
+			{
+				driver:   "postgres",
+				args:     []string{name, "--dir", dir, "-s"},
+				sequence: "000003",
+			},
+			{
+				driver:   "mysql",
+				args:     []string{name, "--dir", dir, "-s"},
+				sequence: "000003",
+			},
+		}
+
+		for _, tc := range cases {
+			args := append(tc.args, "--driver", tc.driver)
+
+			_, err := testlib.ExecuteCommand(t, cmd, args...)
+			require.NoError(t, err)
+
+			_, fErr := os.Stat(filepath.Join("./tmp", tc.driver, tc.sequence+"_"+name+".down.sql"))
+			require.NoError(t, fErr)
+
+			_, fErr = os.Stat(filepath.Join("./tmp/", tc.driver, tc.sequence+"_"+name+".up.sql"))
+			require.NoError(t, fErr)
+		}
+	})
+
+	t.Run("should correctly return extension", func(t *testing.T) {
+		ext := getExtension("postgres")
+		require.Equal(t, ext, "sql")
+
+		ext = getExtension("mysql")
+		require.Equal(t, ext, "sql")
+
+		ext = getExtension("postgresql")
+		require.Equal(t, ext, "txt")
+
+		ext = getExtension("mysqlite")
+		require.Equal(t, ext, "txt")
+	})
+}
diff --git a/commands/testlib/testing.go b/commands/testlib/testing.go
new file mode 100644
index 0000000..00b870b
--- /dev/null
+++ b/commands/testlib/testing.go
@@ -0,0 +1,21 @@
+package testlib
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/spf13/cobra"
+)
+
+func ExecuteCommand(t *testing.T, c *cobra.Command, args ...string) (string, error) {
+	t.Helper()
+
+	buf := new(bytes.Buffer)
+	c.SetOut(buf)
+	c.SetErr(buf)
+	c.SetArgs(args)
+
+	err := c.Execute()
+	return strings.TrimSpace(buf.String()), err
+}