diff --git a/router_test.go b/router_test.go
index 2b1a8a44..b444c7b9 100644
--- a/router_test.go
+++ b/router_test.go
@@ -27,6 +27,25 @@ func (this *TestController) GetUrl() {
 	this.Ctx.Output.Body([]byte(this.UrlFor(".Myext")))
 }
 
+type ResStatus struct {
+	Code int
+	Msg  string
+}
+
+type JsonController struct {
+	Controller
+}
+
+func (this *JsonController) Prepare() {
+	this.Data["json"] = "prepare"
+	this.ServeJson(true)
+}
+
+func (this *JsonController) Get() {
+	this.Data["Username"] = "astaxie"
+	this.Ctx.Output.Body([]byte("ok"))
+}
+
 func TestUrlFor(t *testing.T) {
 	handler := NewControllerRegistor()
 	handler.Add("/api/list", &TestController{}, "*:List")
@@ -151,3 +170,15 @@ func TestStatic(t *testing.T) {
 		t.Errorf("handler.Static failed to serve file")
 	}
 }
+
+func TestPrepare(t *testing.T) {
+	r, _ := http.NewRequest("GET", "/json/list", nil)
+	w := httptest.NewRecorder()
+
+	handler := NewControllerRegistor()
+	handler.Add("/json/list", &JsonController{})
+	handler.ServeHTTP(w, r)
+	if w.Body.String() != `"prepare"` {
+		t.Errorf(w.Body.String() + "user define func can't run")
+	}
+}