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 eventOptional = eventRepository.findOneById(eventDTO.getId());
eventOptional.orElseThrow(() -> new BadRequestException(EVENT_NOT_FOUND));
//...
}
}
And the test class:
@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
//...
}
}
解决方案
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.