MapStruct：模仿嵌套映射器

Question

我使用MapStruct来映射我的实体，我使用Mockito来嘲笑我的对象。

我想用MapStruct测试一个包含映射的方法。问题是嵌套映射器在我的单元测试中总是为null（在应用程序中工作得很好）

@Mapper(componentModel = "spring", uses = MappingUtils.class)
public interface MappingDef {
     UserDto userToUserDto(User user)
}

@Mapper(componentModel = "spring")
public interface MappingUtils {
    //.... other mapping methods used by userToUserDto

@Service
public class SomeClass{
        @Autowired
        private MappingDef mappingDef;

        public UserDto myMethodToTest(){

        // doing some business logic here returning a user
        // User user = Some Business Logic

        return mappingDef.userToUserDto(user)
}

@RunWith(MockitoJUnitRunner.class)
public class NoteServiceTest {

    @InjectMocks
    private SomeClass someClass;
    @Spy
    MappingDef mappingDef = Mappers.getMapper(MappingDef.class);
    @Spy
    MappingUtils mappingUtils = Mappers.getMapper(MappingUtils.class);

    //initMocks is omitted for brevity

    @test
    public void someTest(){
         UserDto userDto = someClass.myMethodToTest();

         //and here some asserts
    }

Answer 1

如果您愿意使用Spring test util，那么使用org.springframework.test.util.ReflectionTestUTILS非常容易。

MappingDef mappingDef = Mappers.getMapper(MappingDef.class);
MappingUtils mappingUtils = Mappers.getMapper(MappingUtils.class);

...

// Somewhere appropriate
@Before
void before() {
    ReflectionTestUtils.setField(
        mappingDef,
        "mappingUtils",
        mappingUtils
    )
}