diff --git a/client/src/test/java/org/apache/rocketmq/client/impl/factory/MQClientInstanceTest.java b/client/src/test/java/org/apache/rocketmq/client/impl/factory/MQClientInstanceTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..956cdd9065529003030e901131c06c26014ebdc7
--- /dev/null
+++ b/client/src/test/java/org/apache/rocketmq/client/impl/factory/MQClientInstanceTest.java
@@ -0,0 +1,123 @@
+/*
+ * 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 org.apache.rocketmq.client.impl.factory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import org.apache.rocketmq.client.ClientConfig;
+import org.apache.rocketmq.client.admin.MQAdminExtInner;
+import org.apache.rocketmq.client.exception.MQBrokerException;
+import org.apache.rocketmq.client.impl.MQClientAPIImpl;
+import org.apache.rocketmq.client.impl.MQClientManager;
+import org.apache.rocketmq.client.impl.consumer.MQConsumerInner;
+import org.apache.rocketmq.client.impl.producer.DefaultMQProducerImpl;
+import org.apache.rocketmq.client.impl.producer.TopicPublishInfo;
+import org.apache.rocketmq.common.protocol.route.BrokerData;
+import org.apache.rocketmq.common.protocol.route.QueueData;
+import org.apache.rocketmq.common.protocol.route.TopicRouteData;
+import org.apache.rocketmq.remoting.exception.RemotingException;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+@RunWith(MockitoJUnitRunner.class)
+public class MQClientInstanceTest {
+
+    @Mock
+    private static MQClientAPIImpl mqClientAPI;
+    @InjectMocks
+    private static MQClientInstance mqClientInstance =  MQClientManager.getInstance().getAndCreateMQClientInstance(new ClientConfig());;
+
+    private String topic = "FooBar";
+    private String group = "FooBarGroup";
+
+    @Test
+    public void testTopicRouteData2TopicPublishInfo() {
+        TopicRouteData topicRouteData = new TopicRouteData();
+
+        topicRouteData.setFilterServerTable(new HashMap<String, List<String>>());
+        List<BrokerData> brokerDataList = new ArrayList<>();
+        BrokerData brokerData = new BrokerData();
+        brokerData.setBrokerName("BrokerA");
+        brokerData.setCluster("DefaultCluster");
+        HashMap<Long, String> brokerAddrs = new HashMap<>();
+        brokerAddrs.put(0L, "127.0.0.1");
+        brokerData.setBrokerAddrs(brokerAddrs);
+        brokerDataList.add(brokerData);
+        topicRouteData.setBrokerDatas(brokerDataList);
+
+        List<QueueData> queueDataList = new ArrayList<>();
+        QueueData queueData = new QueueData();
+        queueData.setBrokerName("BrokerA");
+        queueData.setPerm(2);
+        queueData.setReadQueueNums(3);
+        queueData.setWriteQueueNums(4);
+        queueData.setTopicSynFlag(0);
+        queueDataList.add(queueData);
+        topicRouteData.setQueueDatas(queueDataList);
+
+        TopicPublishInfo topicPublishInfo = MQClientInstance.topicRouteData2TopicPublishInfo(topic, topicRouteData);
+
+        assertThat(topicPublishInfo.isHaveTopicRouterInfo()).isFalse();
+        assertThat(topicPublishInfo.getMessageQueueList().size()).isEqualTo(4);
+    }
+
+    @Test
+    public void testRegisterProducer() {
+        boolean flag = mqClientInstance.registerProducer(group, mock(DefaultMQProducerImpl.class));
+        assertThat(flag).isTrue();
+
+        flag = mqClientInstance.registerProducer(group, mock(DefaultMQProducerImpl.class));
+        assertThat(flag).isFalse();
+
+        mqClientInstance.unregisterProducer(group);
+        flag = mqClientInstance.registerProducer(group, mock(DefaultMQProducerImpl.class));
+        assertThat(flag).isTrue();
+    }
+
+    @Test
+    public void testRegisterConsumer() throws RemotingException, InterruptedException, MQBrokerException {
+        boolean flag = mqClientInstance.registerConsumer(group, mock(MQConsumerInner.class));
+        assertThat(flag).isTrue();
+
+        flag = mqClientInstance.registerConsumer(group, mock(MQConsumerInner.class));
+        assertThat(flag).isFalse();
+
+        mqClientInstance.unregisterConsumer(group);
+        flag = mqClientInstance.registerConsumer(group, mock(MQConsumerInner.class));
+        assertThat(flag).isTrue();
+    }
+
+    @Test
+    public void testRegisterAdminExt() {
+        boolean flag = mqClientInstance.registerAdminExt(group, mock(MQAdminExtInner.class));
+        assertThat(flag).isTrue();
+
+        flag = mqClientInstance.registerAdminExt(group, mock(MQAdminExtInner.class));
+        assertThat(flag).isFalse();
+
+        mqClientInstance.unregisterAdminExt(group);
+        flag = mqClientInstance.registerAdminExt(group, mock(MQAdminExtInner.class));
+        assertThat(flag).isTrue();
+    }
+}
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