diff --git a/net/goai/goai_z_unit_test.go b/net/goai/goai_z_unit_test.go
index 1c58610c8..f52c748fa 100644
--- a/net/goai/goai_z_unit_test.go
+++ b/net/goai/goai_z_unit_test.go
@@ -1151,7 +1151,7 @@ func Test_NameFromJsonTag(t *testing.T) {
 	gtest.C(t, func(t *gtest.T) {
 		type CreateReq struct {
 			gmeta.Meta `path:"/CreateReq" method:"POST"`
-			Name       string `json:"nick_name, omitempty"`
+			Name       string `json:"nick_name,omitempty"`
 		}
 
 		var (
@@ -1172,7 +1172,7 @@ func Test_NameFromJsonTag(t *testing.T) {
 	gtest.C(t, func(t *gtest.T) {
 		type CreateReq struct {
 			gmeta.Meta `path:"/CreateReq" method:"GET"`
-			Name       string `json:"nick_name, omitempty" in:"header"`
+			Name       string `json:"nick_name,omitempty" in:"header"`
 		}
 		var (
 			err error
diff --git a/util/gconv/gconv_z_unit_builtin_gtime_theory_test.go b/util/gconv/gconv_z_unit_builtin_gtime_theory_test.go
index 67c26166e..6bce71177 100644
--- a/util/gconv/gconv_z_unit_builtin_gtime_theory_test.go
+++ b/util/gconv/gconv_z_unit_builtin_gtime_theory_test.go
@@ -1,3 +1,9 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
 package gconv_test
 
 import (
diff --git a/util/gconv/gconv_z_unit_string_test.go b/util/gconv/gconv_z_unit_string_test.go
index 509e4cc8e..d085ecd4a 100644
--- a/util/gconv/gconv_z_unit_string_test.go
+++ b/util/gconv/gconv_z_unit_string_test.go
@@ -70,6 +70,9 @@ var stringTests = []struct {
 	{gvar.New(123), "123"},
 	{gvar.New(123.456), "123.456"},
 
+	{myString("123"), "123"},
+	{(*myString)(nil), ""},
+
 	{goTime, "1911-10-10 00:00:00 +0000 UTC"},
 	{&goTime, "1911-10-10 00:00:00 +0000 UTC"},
 	// TODO The String method of gtime not equals to time.Time
@@ -77,6 +80,7 @@ var stringTests = []struct {
 	{&gfTime, "1911-10-10 00:00:00"},
 	//{gfTime, "1911-10-10 00:00:00 +0000 UTC"},
 	//{&gfTime, "1911-10-10 00:00:00 +0000 UTC"},
+
 }
 
 var (