Spock测试：调用太多

Question

public class ReQueueService {
  private final RabbitTemplate rabbitTemplate;

  public void retry() {
    InfoLog infoLog;
    while (rabbitTemplate != null && 
      (infoLog = (InfoLog) rabbitTemplate.receiveAndConvert(EVENT_WAITING_FOR_REQUEUE)) != null
    ) {
      rabbitTemplate.convertAndSend(SOME_QUEUE, infoLog.getSomeEvent());
    }
  }
}

Too many invocations for:

1 * rabbitTemplate.convertAndSend(SOME_QUEUE, _ as SomeEvent) >> {
      arguments ->
        assert infoLog.getSomeEvent() == arguments[1]
    }   (2 invocations)

Matching invocations (ordered by last occurrence):

2 * rabbitTemplate.convertAndSend(SOME_QUEUE, ...

class ReQueueServiceTest extends Specification {
  def "should resend single event to some queue" () {
    given:
    InfoLog infoLog = Fixtures.createInfoLog()
    def rabbitTemplate = Mock(RabbitTemplate){
      receiveAndConvert(EVENT_WAITING_FOR_REQUEUE) >> { infoLog }
    }
    ReQueueService reSyncService = new ReQueueService(rabbitTemplate)

    when:
    reSyncService.retry()

    then:
    1 * rabbitTemplate.convertAndSend(SOME_QUEUE, _ as SomeEvent) >> {
      arguments ->
        assert infoLog.getSomeEvent() == arguments[1]
    }
  }
}

编辑：

链接到repo示例：https://gitlab.com/bartekwichowski/spock-too-many

Answer 1

谢谢你的回购链接。一旦我能够运行测试并实时检查行为，就很容易发现哪里出了问题。首先，我将对您实际想要测试的内容进行一个有根据的猜测：

1. 模拟的receiveandconvert方法在第一次调用时应该返回str，然后在再次调用时返回null。
2. 随后，您需要验证while循环是否恰好运行了1次迭代，即convertandsend是否使用了您所需的参数调用。

这可以通过以下方式实现

null

class ReSyncServiceTest extends Specification {
  def "should resend single event to resource sync queue"() {
    given:
    def message = "someValue"
    def rabbitTemplate = Mock(RabbitTemplate) {
      receiveAndConvert("FOO") >>> [message, null]
    }

    when:
    new ReSyncService(rabbitTemplate).retry()

    then:
    1 * rabbitTemplate.convertAndSend("BAR", message)
  }
}

@Slf4j
@Service
@AllArgsConstructor
public class ReSyncService {
  private final RabbitTemplate rabbitTemplate;

  public void retry() {
    if (rabbitTemplate == null)
      return;
    String event;
    while (null != (event = getEventFromQueue()))
      rabbitTemplate.convertAndSend("BAR", event);
  }

  protected String getEventFromQueue() {
    return (String) rabbitTemplate.receiveAndConvert("FOO");
  }
}