有沒有辦法用嵌套的 Mapper 對 Mapstruct 進行單元測試？

Question

我正在嘗試對 Mapstruct 嵌套映射器進行單元測試，如下所示：

@Mapper(componentModel = "spring", uses = EventCategoryMapper.class, injectionStrategy = InjectionStrategy.CONSTRUCTOR)
public interface EventMapper {

    
    Event fromEventMO(EventMO eventMO);

    EventMO toEventMO(Event event);

    default Optional<Event> fromOptionalEventMO(Optional<EventMO> optionalEventMO) {
        
        return (optionalEventMO.isEmpty()) ? Optional.empty() : Optional.of(fromEventMO(optionalEventMO.get()));
        
    }
    
}

@Mapper(componentModel = "spring", injectionStrategy = InjectionStrategy.CONSTRUCTOR)
public interface EventCategoryMapper {

    
    EventCategory fromEventCategoryMO(EventCategoryMO eventCategoryMO);

    EventCategoryMO toEventCategoryMO(EventCategory eventCategory);

    default String fromPriorityMO(PriorityMO priority) {
        return (priority.getPriority()==null) ? null : priority.getPriority();
    }

我正在嘗試測試 EventMapper：

@ExtendWith(SpringExtension.class)
@ContextConfiguration(classes = {EventMapper.class, EventCategoryMapper.class, EventMapperImpl.class, EventCategoryMapperImpl.class})
public class EventMapperTest {

    private Mocks mocks; //This object contains the mocked objects that should be mapped.

    @Autowired
    private EventMapper eventMapper;

    @Test
    @DisplayName("Should return an Event from an EventMO")
    void shouldReturnEventfromEventMO() {
        
        var event = eventMapper.fromEventMO(mocks.getEventMO());

        assertEquals(event.getId(), 123L);


    }

但它一直失敗：

創建名為“eventMapper”的 bean 時出錯：bean 實例化失敗； 嵌套異常是 org.springframework.beans.BeanInstantiationException：無法實例化 [com.mycompany.cna.projects.fishmarket.back.events.repositories.mappers.event.EventMapper]：指定 class 是一個接口

我已經嘗試使用 Mapper.getMapper(EventMapper.class) 實例化映射器，它返回了 NullPointerException。

我應該怎么做才能對這些映射器進行單元測試？

Answer 1

我已經解決了這個問題。 問題是我沒有實例化我的 Mocks object。 我還在 before 方法中為 EventMapperImpl 提供了嵌套映射器的模擬：

    @ExtendWith(SpringExtension.class)
public class EventMapperTest {

    private Mocks mocks;

    private EventMapper eventMapper;

    @Mock
    private EventCategoryMapper eventCategoryMapper;

    @BeforeEach
    void before() {
        eventMapper = new EventMapperImpl(eventCategoryMapper);
        mocks = new Mocks();
    }
    
    @Test
    @DisplayName("Should return an Event from an EventMO")
    void shouldReturnEventfromEventMO() {

        when(eventCategoryMapper.fromEventCategoryMO(any(EventCategoryMO.class))).thenReturn(mocks.getEventCategory());
        var event = eventMapper.fromEventMO(mocks.getEventMO());

        assertEquals(event.getId(), 123L);


    }