diff --git a/.vscode/settings.json b/.vscode/settings.json
index 67cdf77..05f4970 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,8 +1,12 @@
 {
     "cSpell.words": [
+        "charsets",
         "menv",
         "MINIT",
+        "mlog",
         "mtmpl",
-        "munit"
+        "munit",
+        "shellquote",
+        "simplifiedchinese"
     ]
 }
\ No newline at end of file
diff --git a/pkg/mexec/manager.go b/pkg/mexec/manager.go
index 8cb24c3..57936fa 100644
--- a/pkg/mexec/manager.go
+++ b/pkg/mexec/manager.go
@@ -158,7 +158,7 @@ func (m *manager) Execute(opts ExecuteOptions) (err error) {
 	}
 	defer done()
 
-	opts.Logger.Print("minit: " + opts.Name + ": process started")
+	opts.Logger.Printf("minit: %s: process started", opts.Name)
 
 	// streaming
 	go opts.Logger.Out().ReadFrom(outPipe)
@@ -170,23 +170,23 @@ func (m *manager) Execute(opts ExecuteOptions) (err error) {
 	var code int
 
 	if err != nil {
+		opts.Logger.Errorf("minit: %s: process exited with error: %s", opts.Name, err.Error())
 		if ee, ok := err.(*exec.ExitError); ok {
 			code = ee.ExitCode()
 		} else {
-			opts.Logger.Error("minit: " + opts.Name + ": process exited with error: " + err.Error())
 			return
 		}
 	}
 
 	if checkSuccessCode(opts.SuccessCodes, code) {
 		err = nil
-		opts.Logger.Print("minit: " + opts.Name + ": process exited successfully")
+		opts.Logger.Printf("minit: %s: exit code %d is in success_codes", opts.Name, code)
 		return
 	}
 
 	err = fmt.Errorf("exit code: %d is not in success_codes", code)
 
-	opts.Logger.Error("minit: " + opts.Name + ": process exited with error: " + err.Error())
+	opts.Logger.Errorf("minit: %s: process exited with error: %s", opts.Name, err.Error())
 
 	return
 }
diff --git a/pkg/mexec/manager_test.go b/pkg/mexec/manager_test.go
index 2d26864..a43525b 100644
--- a/pkg/mexec/manager_test.go
+++ b/pkg/mexec/manager_test.go
@@ -39,6 +39,7 @@ func TestNewManager(t *testing.T) {
 
 	buf, err := os.ReadFile(filepath.Join("testdata", "test.out.log"))
 	require.Contains(t, string(buf), "BBB")
+	require.NoError(t, err)
 
 	go func() {
 		time.Sleep(time.Second)
@@ -55,9 +56,9 @@ func TestNewManager(t *testing.T) {
 		Command: []string{
 			"sleep", "$AAA",
 		},
-		Logger: logger,
+		Logger:       logger,
+		SuccessCodes: []int{0, 130, -1},
 	})
 	require.NoError(t, err)
-
-	require.True(t, time.Now().Sub(t1) < time.Second*2)
+	require.True(t, time.Since(t1) < time.Second*2)
 }