How to use a real mapstruct mapper method in test?

Question

I have a class that uses mapper in one of the methods to return the result as a list of DTOs. I want to use a real mapper method as it gives me possibility to check real functionality.

It's my test class:

@ExtendWith(MockitoExtension.class) public class UserCardServiceTest { @Mock private MyCardRepository myCardRepository; @Mock(answer = Answers.CALLS_REAL_METHODS) private MyMapper myMapper; @InjectMocks private MyServiceImpl underTest; @BeforeEach void setUp() { listOfExpiredUserCardEntities = new ArrayList<>(List.of( getValidUserCardEntity() .setExpirationDate(LocalDate.now().minusDays(1)) .setBlocked(false), getValidUserCardEntity() .setExpirationDate(LocalDate.now().minusWeeks(1)) .setBlocked(false), getValidUserCardEntity() .setExpirationDate(LocalDate.now().minusYears(1)) .setBlocked(false), getValidUserCardEntity() .setExpirationDate(LocalDate.now().minusMonths(1)) .setBlocked(false)); } @Test void shouldChangeStatusIfCardExpired() { given(myCardRepository.findAllByUserId(1L)) .willReturn(listOfCardEntities); assertThat(underTest.getActiveUserCardsById(1L)).isNotNull().hasSize(4); assertThat(underTest.getActiveUserCardsById(1)) .extracting(CardDto::isBlocked) .containsExactly(true, true, true, true) .doesNotContainNull(); }

My method to test:

@RequiredArgsConstructor public class MyServiceImpl implements MyCardService { private final MyCardRepository myCardRepository; private final MyMapper myMapper; @Override public List<CardDto> getActiveUserCardsById(final long userId) { List<CardEntity> listOfEntities = myRepository.findAllByUserId(userId); listOfEntities.stream().filter(validationService::isCardExpired) .forEach(userCard -> userCard.setBlocked(true)); List<CardEntity> sorted = listOfEntities.stream() .sorted(o -> o.getName().toUpperCase()) .toList(); return myMapper .listOfCardEntitiesToCardDto(sorted); }

But as a result I get:

java.lang.AssertionError: Expected size: 4 but was: 0 in: []

Can anyone say how to invoke a real mapstruct mapper method, but not prepared answer. Is it possible to do with only @ExtendWith(MockitoExtension.class)?

What exactly do you want to achieve? What does "use a real mapper method" mean? — Z-100
– Z-100, Commented Feb 6, 2023 at 8:40
please confirm if the listOfCardEntities in your test class is empty or have values — SpringLearner
– SpringLearner, Commented Feb 6, 2023 at 8:42
@Z-100 mainly i want to test this part of the method with listOfCardEntities (i give it through mock) listOfEntities.stream().filter(validationService::isCardExpired) .forEach(userCard -> userCard.setBlocked(true)); Then i want mapper maps the result as it would do in any usual case, when we call the method out of tests. It should return List<CardDto> with 4 elements, but i always get 0 — idelkaro
– idelkaro, Commented Feb 6, 2023 at 8:51
@idelkaro As far as I know, you can just annotate private MyMapper myMapper with @Mock and Mockito just creates an instance of that variable and inserts it into MyServiceImpl. Btw. Have you used a Debugger before? That would come in pretty handy here I think. And btw^2: Could you maybe provide us with your Mapper? (Not the impl) — Z-100
– Z-100, Commented Feb 6, 2023 at 8:57

GJohannes · Accepted Answer · 2023-02-06 09:01:52Z

I had the same problem in my projects. I am using the following solution:

import org.mapstruct.factory.Mappers; import org.mockito.InjectMocks; import org.mockito.Mock; import org.mockito.Spy; ..... @Mock private MyCardRepository myCardRepository; @Spy private MyMapper myMapper = Mappers.get(MyMapper.class); @InjectMocks private MyServiceImpl underTest;

This works with only @ExtendWith(MockitoExtension.class). There is no need to start the entire SpringBoot Context ;)

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