diff --git a/server_test.go b/server_test.go
index 240eeef..93081a2 100644
--- a/server_test.go
+++ b/server_test.go
@@ -257,8 +257,6 @@ func buildReqTmpQr(val, expire int32) *http.Request {
 	return req
 }
 
-
-
 func buildReqCommonHeader(r *http.Request) {
 	//
 	// example request
@@ -285,3 +283,13 @@ func buildReqCommonHeader(r *http.Request) {
 	r.Header.Set("X-Forwarded-Server", "wechat.hitxy.org.au")
 
 }
+
+func TestBuildQueryString(t *testing.T) {
+	url := "http://www.hitxy.org.au/crmcache?a=abc"
+	newURL := buildSignatureAppend2Url(url, IntraAPIConfig.CRMSecrete)
+	//log.Println(newURL)
+	AssertEqual(t, url != newURL, true, "URL append signature should be correct")
+	req, err := http.NewRequest("GET", newURL, nil)
+	AssertEqual(t, err, nil, "pase new URL should be correct")
+	AssertEqual(t, checkSignatureByToken(req, IntraAPIConfig.CRMSecrete), true, "check signature shold be correct")
+}