Mockito.when().thenReturn()不起作用或返回null [英] Mockito.when().thenReturn() doesn't work or returns null

问题描述

在测试期间，将引发NullPointerException.我尝试对其进行调试，但我得出的唯一结论是eventOptional始终为null.就像Mockito.when().thenReturn()无法正常工作一样.有人可以帮忙吗?这是我用于测试服务和测试本身的代码:

During the test there is a NullPointerException thrown. I tried to debug it and the only thing I worked out was that eventOptional is always null. Just as if Mockito.when().thenReturn() didn't work. Can anybody help? Here's my code for a tested service and for the test itself:

@Service
public class EventService {

    @Autowired 
    public EventService(EventRepository eventRepository) {
        this.eventRepository = eventRepository;
    }
    //...
    public void updateEvent(EventDTO eventDTO) {
        Optional<Event> eventOptional = eventRepository.findOneById(eventDTO.getId());

        eventOptional.orElseThrow(() -> new BadRequestException(EVENT_NOT_FOUND));
        //...
    }
}

和测试类:

@RunWith(MockitoJUnitRunner.class)
public class EventServiceTest {

    @Mock
    private EventRepository eventRepository;
    @InjectMocks
    private EventService eventService;

    private Event sampleEventFromDb;

    @Before
    public void setUp() throws Exception {

        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void shouldUpdateEventTestAndWithProperTime() throws Exception {
        EventDTO eventDTOMock = Mockito.mock(EventDTO.class);

        sampleEventFromDb = Event.builder()
            .name("name")
            .startDateTime(LocalDateTime.now())
            .placeName("place")
            .description("description")
            .publicEvent(true)
            .owner(new User())
            .build();

        Mockito.when(eventRepository.findOneById(anyString())).thenReturn(Optional.of(sampleEventFromDb));
        Mockito.when(eventDTOMock.getId()).thenReturn("1");

        eventService.updateEvent(eventDTOMock); //NullPointerException
        //...
    }
}

推荐答案

问题似乎是initMock被调用了两次:一次由运行器调用，一次由setUp方法调用.使用常规运行程序运行测试或从setUp方法中删除initMocks调用即可解决此问题.

Looks like the problem is that initMock is called twice: once by the runner and once by the setUp method. Running the test with the regular runner or removing the initMocks call from the setUp method fixes this problem.

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