有没有办法用嵌套映射器对Mapstruct进行单元测试？

Question

我正在尝试按如下方式对Mapstruct嵌套映射器进行单元测试：

@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 = "html" target="_blank">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();
    }

我正在尝试测试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);


    }

但它在以下方面不断失败：

创建名为“eventMapper”的bean时出错：bean的实例化失败；嵌套的异常是org。springframework。豆。BeanInstationException:未能实例化[com.mycompany.cna.projects.fishmarket.back.events.repositories.mappers.event.EventMapper]：指定的类是接口

我已经尝试用Mapper.get映射器（EventMapper.class）实例化映射器，它返回了一个NullPointerExcure。

我应该如何在这些映射器上实现单元测试？

Answer 1

我已经解决了这个问题。问题是我没有实例化我的Mocks对象。我还在before方法中为EventMapperImpl提供了嵌套映射器的模拟：

    @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);


    }