public void createTopic(final String addr, final String defaultTopic, final TopicConfig topicConfig,
        final long timeoutMillis)
        throws RemotingException, MQBrokerException, InterruptedException, MQClientException {
        Validators.checkTopicConfig(topicConfig);

        CreateTopicRequestHeader requestHeader = new CreateTopicRequestHeader();
        requestHeader.setTopic(topicConfig.getTopicName());
        requestHeader.setDefaultTopic(defaultTopic);
        requestHeader.setReadQueueNums(topicConfig.getReadQueueNums());
        requestHeader.setWriteQueueNums(topicConfig.getWriteQueueNums());
        requestHeader.setPerm(topicConfig.getPerm());
        requestHeader.setTopicFilterType(topicConfig.getTopicFilterType().name());
        requestHeader.setTopicSysFlag(topicConfig.getTopicSysFlag());
        requestHeader.setOrder(topicConfig.isOrder());
        requestHeader.setAttributes(AttributeParser.parseToString(topicConfig.getAttributes()));

        RemotingCommand request = RemotingCommand.createRequestCommand(RequestCode.UPDATE_AND_CREATE_TOPIC, requestHeader);

        RemotingCommand response = this.remotingClient.invokeSync(MixAll.brokerVIPChannel(this.clientConfig.isVipChannelEnabled(), addr),
            request, timeoutMillis);
        assert response != null;
        switch (response.getCode()) {
            case ResponseCode.SUCCESS: {
                return;
            }
            default:
                break;
        }

        throw new MQClientException(response.getCode(), response.getRemark());
    }
@Test
    public void testCreateTopic_Success() throws Exception {
        doAnswer((Answer<RemotingCommand>) mock -> {
            RemotingCommand request = mock.getArgument(1);

            RemotingCommand response = RemotingCommand.createResponseCommand(null);
            response.setCode(ResponseCode.SUCCESS);
            response.setOpaque(request.getOpaque());
            return response;
        }).when(remotingClient).invokeSync(anyString(), any(RemotingCommand.class), anyLong());

        mqClientAPI.createTopic(brokerAddr, topic, new TopicConfig(), 10000);
    }