[FIXED] Quarkus Junit5 mock functions from the same class

Issue

I am trying to mock a function that is called by other function that I am trying to unit test. I am currently using the following code, following the suggestions given here:

@QuarkusTest
public class SampleServiceTest {
    @Inject
    SampleService sampleService;

    @Test
    public void testFindById() {
        // Given
        final Sample sample = SampleDataProvider.createSample();
        final SampleResponse expectedResponse = SampleDataProvider.createSampleResponse();
        MockedStatic<SampleResponseAssembler> mockedStatic = mockStatic(SampleResponseAssembler.class);

        // When
        doReturn(sample).when(sampleService).findSampleById(SampleDataProvider.ID);
        mockedStatic.when(() -> SampleResponseAssembler.fromSample(sample)).thenReturn(expectedResponse);
        final SampleResponse sampleResponse = sampleService.findById(SampleDataProvider.ID);

        // Then
        verify(sampleService, times(1)).findSampleById(SampleDataProvider.ID);
        mockedStatic.verify(() -> SampleResponseAssembler.fromSample(sample), times(1));
        assertEquals(expectedResponse, sampleResponse);
    }
}

The functions being tested:

    public SampleResponse findById(final UUID id) {
        LOGGER.debug("findById. id={}", id);
        
        return SampleResponseAssembler.fromSample(findSampleById(id));
    }

    public Sample findSampleById(final UUID id) {
        LOGGER.debug("findSampleById. id={}", id);

        final Optional<Sample> optionalSample = sampleRepository.findById(id);
        return optionalSample
                .orElseThrow(() -> new NotFoundException(NotFoundException.NotFoundErrorMessage.SAMPLE_ID,
                        id.toString()));
    }

I basically want to be able to mock the findSampleById function. I already made this change and it worked properly but "initMocks" is deprecated so I need another solution:

    @Spy
    @InjectMocks
    SampleService sampleService;

    @Mock
    SampleRepository sampleRepositoryMock;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.initMocks(this);
    }

Solution

Use @ExtendWith(MockitoExtension.class) instead of @QuarkusTest.

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.Spy;
import org.mockito.runners.MockitoJUnitRunner;

@ExtendWith(MockitoExtension.class)
class SampleServiceTest {

    @Spy
    @InjectMocks
    SampleService sampleService;

    @Mock
    SampleRepository sampleRepositoryMock;

    @BeforeEach
    void setUp() {
        // Not needed
    }

    @Test
    void testFindById() {
        // ...
    }
}

Also, IMO, if we have to mock findSampleById to test findById, you should split them into two classes and not use @Spy. When the code is hard to test it may be the case it needs to be better designed.

Answered By - Edgar Domingues