diff --git a/config_center/dynamic_configuration_test.go b/config_center/dynamic_configuration_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..8b5a8d7cc5afea8559d563f82f5b2dd80c51488e
--- /dev/null
+++ b/config_center/dynamic_configuration_test.go
@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package config_center
+
+import (
+	"testing"
+	"time"
+)
+
+import (
+	"github.com/stretchr/testify/assert"
+)
+
+import (
+	"github.com/apache/dubbo-go/common"
+)
+
+func TestWithTimeout(t *testing.T) {
+	fa := WithTimeout(12 * time.Second)
+	opt := &Options{}
+	fa(opt)
+	assert.Equal(t, 12*time.Second, opt.Timeout)
+}
+
+func TestGetRuleKey(t *testing.T) {
+	url, err := common.NewURL("dubbo://192.168.1.1:20000/com.ikurento.user.UserProvider?interface=test&group=groupA&version=0")
+	assert.NoError(t, err)
+	assert.Equal(t, "test:0:groupA", GetRuleKey(url))
+}
diff --git a/config_center/nacos/client_test.go b/config_center/nacos/client_test.go
index 71bb5bd96c5428542c6bfd5211e41438b78bfeb6..53ab325c955517a859dab0df358a0387179351d3 100644
--- a/config_center/nacos/client_test.go
+++ b/config_center/nacos/client_test.go
@@ -56,7 +56,7 @@ func Test_newNacosClient(t *testing.T) {
 
 func Test_setNacosClient(t *testing.T) {
 	server := mockCommonNacosServer()
-	nacosURL := strings.ReplaceAll(server.URL, "http", "registry")
+	nacosURL := server.Listener.Addr().String()
 	registryUrl, _ := common.NewURL(nacosURL)
 	c := &nacosDynamicConfiguration{
 		url:  &registryUrl,
@@ -87,3 +87,28 @@ func Test_setNacosClient(t *testing.T) {
 	<-c.client.Done()
 	c.Destroy()
 }
+
+func Test_newNacosClient_connectError(t *testing.T) {
+	nacosURL := "registry://127.0.0.1:8888"
+	registryUrl, err := common.NewURL(nacosURL)
+	assert.NoError(t, err)
+	c := &nacosDynamicConfiguration{
+		url:  &registryUrl,
+		done: make(chan struct{}),
+	}
+	err = ValidateNacosClient(c, WithNacosName(nacosClientName))
+	assert.NoError(t, err)
+	c.wg.Add(1)
+	go HandleClientRestart(c)
+	go func() {
+		// c.client.Close() and <-c.client.Done() have order requirements.
+		// If c.client.Close() is called first.It is possible that "go HandleClientRestart(c)"
+		// sets c.client to nil before calling c.client.Done().
+		time.Sleep(time.Second)
+		c.client.Close()
+	}()
+	<-c.client.Done()
+	// let client do retry
+	time.Sleep(5 * time.Second)
+	c.Destroy()
+}