diff --git a/common/url_test.go b/common/url_test.go
index ff5463275ebc9e7b79f979d7632c4cac225cdd39..21c1aeeb15fae9efdee1008acdd22578a70caa5c 100644
--- a/common/url_test.go
+++ b/common/url_test.go
@@ -16,12 +16,12 @@ package common
 
 import (
 	"context"
-	"github.com/dubbo/go-for-apache-dubbo/common/constant"
 	"net/url"
 	"testing"
 )
 
 import (
+	"github.com/dubbo/go-for-apache-dubbo/common/constant"
 	"github.com/stretchr/testify/assert"
 )
 
diff --git a/common/utils/strings_test.go b/common/utils/strings_test.go
index 37db5700446be999a147a259a25e7c16b4805cbb..73080ab9eef1016d88a7a49063d473aeee2e1ea1 100644
--- a/common/utils/strings_test.go
+++ b/common/utils/strings_test.go
@@ -1,9 +1,11 @@
 package utils
 
 import (
-	"github.com/stretchr/testify/assert"
 	"testing"
 )
+import (
+	"github.com/stretchr/testify/assert"
+)
 
 func Test_RegSplit(t *testing.T) {
 	strings := RegSplit("dubbo://123.1.2.1;jsonrpc://127.0.0.1;registry://3.2.1.3?registry=zookeeper", "\\s*[;]+\\s*")
diff --git a/config/reference_config.go b/config/reference_config.go
index 2124cd44e4caf7b585d084841235e6044899dd05..fb83b8001a3a1339b2c7a3c294f7519d0dfa6025 100644
--- a/config/reference_config.go
+++ b/config/reference_config.go
@@ -109,7 +109,7 @@ func (refconfig *ReferenceConfig) Refer() {
 		refconfig.invoker = extension.GetProtocol(refconfig.urls[0].Protocol).Refer(*refconfig.urls[0])
 	} else {
 		invokers := []protocol.Invoker{}
-		var regUrl *common.URL = nil
+		var regUrl *common.URL
 		for _, u := range refconfig.urls {
 			invokers = append(invokers, extension.GetProtocol(u.Protocol).Refer(*u))
 			if u.Protocol == constant.REGISTRY_PROTOCOL {
diff --git a/config/testdata/consumer_config.yml b/config/testdata/consumer_config.yml
index 8a9aeafac99da3a51a58a2dc7815b089987c867f..db242c95ad1f1eae32f2e84166263860c2030b48 100644
--- a/config/testdata/consumer_config.yml
+++ b/config/testdata/consumer_config.yml
@@ -38,6 +38,7 @@ references:
   filter: ""
   protocol : "dubbo"
   interface : "com.ikurento.user.UserProvider"
+  url: "dubbo://127.0.0.1:20000"
   cluster: "failover"
   methods :
   - name: "GetUser"