@Override
    public Set<String> getTopicClusterList(
        final String topic) throws InterruptedException, MQBrokerException, MQClientException, RemotingException {
        return this.defaultMQAdminExtImpl.getTopicClusterList(topic);
    }
@Test
    public void testGetTopicClusterList() throws InterruptedException, RemotingException, MQClientException, MQBrokerException {
        Set<String> result = defaultMQAdminExt.getTopicClusterList("unit-test");
        assertThat(result.size()).isEqualTo(0);
    }