🩹Fix render test

.github/single.tmpl

@@ -0,0 +1 @@
+<h1>{{.Title}}</h1>

ctx_test.go

@@ -1396,10 +1396,11 @@ func Test_Ctx_Redirect(t *testing.T) {
 
 // go test -run Test_Ctx_Render
 func Test_Ctx_Render(t *testing.T) {
+	t.Parallel()
 	app := New()
 	ctx := app.AcquireCtx(&fasthttp.RequestCtx{})
 	defer app.ReleaseCtx(ctx)
-	err := ctx.Render("./.github/index.tmpl", Map{
+	err := ctx.Render("./.github/single.tmpl", Map{
 		"Title": "Hello, World!",
 	})
 	utils.AssertEqual(t, nil, err)
@@ -1416,14 +1417,13 @@ func (t *testTemplateEngine) Render(w io.Writer, name string, bind interface{},
 }
 
 func (t *testTemplateEngine) Load() error {
-	t.mu.Lock()
-	defer t.mu.Unlock()
 	t.templates = template.Must(template.ParseGlob("./.github/*.tmpl"))
 	return nil
 }
 
 // go test -run Test_Ctx_Render_Engine
 func Test_Ctx_Render_Engine(t *testing.T) {
+	t.Parallel()
 	engine := &testTemplateEngine{}
 	engine.Load()
 	app := New()