[ROCKETMQ-52] Remove unnecessary stubbing

client/src/test/java/org/apache/rocketmq/client/consumer/DefaultMQPushConsumerTest.java

@@ -55,7 +55,6 @@ import org.mockito.invocation.InvocationOnMock;
 import org.mockito.junit.MockitoJUnitRunner;
 import org.mockito.stubbing.Answer;
 
-import static org.apache.rocketmq.client.producer.DefaultMQProducerTest.createTopicRoute;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
@@ -111,7 +110,6 @@ public class DefaultMQPushConsumerTest {
         when(mQClientFactory.findBrokerAddressInSubscribe(anyString(), anyLong(), anyBoolean())).thenReturn(new FindBrokerResult("127.0.0.1:10911", false));
         mQClientFactory.registerConsumer(consumerGroup, pushConsumerImpl);
         mQClientFactory.start();
-        when(mQClientAPIImpl.getTopicRouteInfoFromNameServer(anyString(), anyLong())).thenReturn(createTopicRoute());
     }
 
     @After