How to mock a member in the Class that you spy with powermockito

Question

How can I mock a member class in another class which has already been spied by PowerMockito.spy()?

@Component
public class BoxFileDao {

    @Autowired
    private BoxFileService boxFileService;

    public void uploadFile() {
         .....
         boxFileService.uploadFile(user, credential);
    }
}

@RunWith(PowerMockRunner.class)
@PrepareForTest(BoxFileDao.class)
public class BoxFileDaoTest {
    @Test
    public void testUploadFile() {
        BoxFileDao mock = PowerMockito.spy(new BoxFileDao());
        (how do I get the boxFileService from mock?)
        mock.uploadFile();
        verify(boxFileService).uploadFile(user, credential);
    }
}

Answer 1

You can use @InjectMock to inject the mocked boxFileService object in the real boxFileDao object. Your test class can be written something like

@RunWith(PowerMockRunner.class)
public class BoxFileDaoTest {

    @Mock
    private BoxFileService boxFileService;

    @InjectMocks
    private BoxFileDao boxFileDao;

    @Test
    public void testUploadFile() {
        boxFileDao.uploadFile();
        verify(boxFileService).uploadFile(user, credential);
    }
}