unify test data (#1417)

mkdir a test data dir.

examples/template/main.go

@@ -20,7 +20,7 @@ func main() {
 	router.SetFuncMap(template.FuncMap{
 		"formatAsDate": formatAsDate,
 	})
-	router.LoadHTMLFiles("../../fixtures/basic/raw.tmpl")
+	router.LoadHTMLFiles("../../testdata/template/raw.tmpl")
 
 	router.GET("/raw", func(c *gin.Context) {
 		c.HTML(http.StatusOK, "raw.tmpl", map[string]interface{}{