如何使用junit测试基于父子kafka的项目

Question

子模块从父级的kafka生产者那里接收请求。子模块仅具有kafak接收和发送功能。父母从其余api获取请求，然后生成孩子的kafka列表器。

我想为上述项目结构编写集成测试用例。我想测试整个应用程序，即接收其余的api调用，然后将请求转发到子模块，然后将响应发送回去。

这是项目结构

这是初始请求到达的api控制器：

@Controller
@RequestMapping(value = "/api")
public class ApiController {

@Autowired
KafkaTemplate<String, String> kafkaTemple;

@RequestMapping(value={"/welcome"}, method = RequestMethod.POST)
@ResponseBody
public PojoClass welcomeUser(@RequestBody String request) {

    // TODO Prepares request to JSON format and forward towards child module
    kafkaTemple.send("ChildTopic", request);

    return new PojoClass("Test","Test Message String");
  }
}

儿童卡夫卡的接收者和制作人

@Component
@EnableKafka
public class KafkaReceiver extends config {

@Autowired
KafkaTemplate<String, String> kafkaTemple;

private static final String kafkaTopic = "ChildTopic";

@KafkaListener(topics = kafkaTopic)
public void listen(List<ConsumerRecord<String, String>> records) {

    // TODO Some parsing and validation

    System.out.println("Received request: " + records);
    kafkaTemple.send("ParentTopic", records + " :Response-true");

  }
}

这是父卡夫卡接收者

@Component
@EnableKafka
public class ParentKafkaReceiver extends config {

private static final String kafkaTopic = "ParentTopic";

@KafkaListener(topics = kafkaTopic)
public void listen(List<ConsumerRecord<String, String>> records) {

    System.out.println("Final result string: " + records);
  }
}

我应该在哪里以及如何编写测试用例？即在父模块或子模块中