Question

我正在为我的应用程序创建一个Spring Boot API。我正在尝试使用Mockito对服务实现进行单元测试以模拟出细节。该服务将向数据库中添加一个新的建筑实体。以下是服务实现和测试实现。建筑服务：

@Slf4j
@Service
public class BuildingServiceImpl implements BuildingService {

private BuildingRepository buildingRepository;
private BuildingRequestToEntityMapper buildingRequestToEntityMapper;

public BuildingServiceImpl(BuildingRepository buildingRepository, BuildingRequestToEntityMapper 
buildingRequestToEntityMapper){
this.buildingRepository=buildingRepository;
this.buildingRequestToEntityMapper=buildingRequestToEntityMapper;
}

public HttpStatus addBuilding(BuildingRequest buildingRequest){
    log.info("Inside addBuilding() service");
    BuildingEntity buildingEntity = buildingRequestToEntityMapper.map(buildingRequest);
    buildingRepository.save(buildingEntity);
    log.info("Building saved "+ buildingEntity);
    return HttpStatus.CREATED;
}

BuildingServiceImpl_UT

@RunWith(MockitoJUnitRunner.class)
public class BuildingServiceImpl_UT {

@Mock
BuildingRequestToEntityMapper buildingRequestToEntityMapper;

@Mock
BuildingRepository buildingRepository;

@InjectMocks
BuildingServiceImpl buildingServiceImpl;

@Test
public void buildingService_MapsRequest_AndSaveEntity(){
BuildingRequest buildingRequest = BuildingRequest.builder()
            .name("TestName")
            .telephone("4444444444")
            .postcode("TEst")
            .address("testAddress").build();

   when(buildingServiceImpl.addBuilding(any(BuildingRequest.class))).thenReturn(HttpStatus.CREATED);
    when(buildingRepository.save(any(BuildingEntity.class))).thenReturn(new BuildingEntity());

    buildingServiceImpl.addBuilding(buildingRequest);
    verify(buildingRepository, times(1)).save(any());
}

我已经模拟了映射器和存储库，并将它们注入到服务中，但是当我运行测试时，在测试类的第一个when（）。thenReturn（）语句中得到了空指针异常。请帮忙。谢谢

Answer 1

我不明白您的第一个when（）。thenReturn（）！您尝试在 buildingServiceImpl 上执行此操作，这不是一个模拟！此外，这没有任何意义，因为您要测试此方法！我认为您应该为模拟 buildingRequestToEntityMapper 定义when（）。thenReturn（），但是在您的实现中，您无需为 buildingRequestToEntityMapper.map（）定义返回值>。在这种情况下，变量 buildingEntity 将具有值 null ，该值应在您的测试用例中起作用。

@RunWith(MockitoJUnitRunner.class)
public class BuildingServiceImpl_UT {

@Mock
BuildingRequestToEntityMapper buildingRequestToEntityMapper;

@Mock
BuildingRepository buildingRepository;

@InjectMocks
BuildingServiceImpl buildingServiceImpl;

    @Test
    public void buildingService_MapsRequest_AndSaveEntity(){
    BuildingRequest buildingRequest = BuildingRequest.builder()
                .name("TestName")
                .telephone("4444444444")
                .postcode("TEst")
                .address("testAddress").build();


        when(buildingRepository.save(any(BuildingEntity.class))).thenReturn(new BuildingEntity());

        buildingServiceImpl.addBuilding(buildingRequest);
        verify(buildingRepository, times(1)).save(any());
        verify(buildingRequestToEntityMapper).map(any());
    }

Answer 2

此：

when(buildingServiceImpl.addBuilding(any(BuildingRequest.class))).thenReturn(HttpStatus.CREATED);

不是必需的，您想测试方法：addBuilding不要模拟它。

使用Mockito进行单元测试时的Nullpointer

2 个答案: