junit测试mockito NullPointerException

Question

我正在使用Mockito编写一个JUnit测试用例，并得到一个NullPointerException。

在我的代码中是这样的：

@Service
@Transactional
public class OrganizationServiceImpl implements OrganizationService {

 private final OrganizationRepository organizationRepository;

 private final OrganizationMapper organizationMapper;

 private final OrganizationSearchRepository organizationSearchRepository;

 public OrganizationServiceImpl(OrganizationRepository organizationRepository, OrganizationMapper organizationMapper,
  OrganizationSearchRepository organizationSearchRepository) {
 this.organizationRepository = organizationRepository;
 this.organizationMapper = organizationMapper;
 this.organizationSearchRepository = organizationSearchRepository;
}

 @Override
 @Transactional(readOnly = true)
 public List<OrganizationDTO> findAll() {
  return organizationRepository.findAll().stream().map(organizationMapper::toDto).collect(Collectors.toCollection(LinkedList::new));
 }
}



@RunWith(MockitoJUnitRunner.class)
public class OrganizationServiceTest {

 @Mock
 private OrganizationRepository organizationRepository;

 @InjectMocks
 private OrganizationServiceImpl organizationService;

 OrganizationMapper organizationMapper = OrganizationMapper.INSTANCE;

 @Before
 public void setup() {
    MockitoAnnotations.initMocks(this);
 }

 @Test
 public void testGetAllOrganization() {
    List<Organization> organizationList = Arrays.asList(organizationInit());

    when(organizationRepository.findAll()).thenReturn(organizationList);

    List<OrganizationDTO> result = organizationService.findAll(); //NullPointerException
    assertEquals(3, result.size());
 }
}

Answer 1

您永远不会嘲弄或将organizationmapper注入到您的服务中。injectmocks所做的是将您用mock注释的内容注入到您的OrganizationServiceImpl中，但是由于您没有在OrganizationMapper上使用mock，mockito不知道它需要使用它。类似这样的东西应该可以修复它：

public class OrganizationServiceTest {

 private OrganizationRepository organizationRepository;

 private OrganizationServiceImpl organizationService;

 private OrganizationSearchRepository searchRepository;

 private OrganizationMapper organizationMapper = OrganizationMapper.INSTANCE;

 @Before
 public void setup() {
    organizationRepository = Mockito.mock(OrganizationRepository.class);
    searchRepository = Mockito.mock(OrganizationSearchRepository.class);
    organizationService = new OrganizationServiceImpl(organizationRepository, organizationMapper, searchRepository);
 }

 @Test
 public void testGetAllOrganization() {
    List<Organization> organizationList = Arrays.asList(organizationInit());

    when(organizationRepository.findAll()).thenReturn(organizationList);

    List<OrganizationDTO> result = organizationService.findAll();
    assertEquals(3, result.size());
 }
}