public TopicRouteData getAnExistTopicRouteData(final String topic) {
        return this.topicRouteTable.get(topic);
    }
@Test
    public void testGetAnExistTopicRouteData() {
        topicRouteTable.put(topic, createTopicRouteData());
        TopicRouteData actual = mqClientInstance.getAnExistTopicRouteData(topic);
        assertNotNull(actual);
        assertNotNull(actual.getQueueDatas());
        assertNotNull(actual.getBrokerDatas());
    }