java - Using @Mock and @InjectMocks

Question

I'm currently studying the Mockito framework and I've created several test cases using Mockito. But then I read that instead of invoking mock(SomeClass.class) I can use the @Mock and the @InjectMocks - The only thing I need to do is to annotate my test class with @RunWith(MockitoJUnitRunner.class) or use the MockitoAnnotations.initMocks(this); in the @Before method.

But it doesn't work - It seems that the @Mock won't work! Here is my 2 codes revisions - one using the annotations and one without.

What am I doing wrong?

public class ReportServiceImplTestMockito {

    private TaskService       mockTaskService; // This is the Mock object
    private ReportServiceImpl service;

    @Before
    public void init(){
        service         = new ReportServiceImpl();
        mockTaskService = mock(TaskServiceImpl.class);
        service.setTaskServiceImpl(mockTaskService);
    }
/// ...

 Some tests
}

As I said - this work great. But the following wont:

@RunWith(MockitoJUnitRunner.class)
public class ReportServiceImplTestMockito {

     @Mock 
     private TaskService      mockTaskService;

     @InjectMocks 
     private ReportServiceImpl service;

         // Some tests
}

And here is the ReportServiceImpl class:

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private TaskService taskServiceImpl;

    public ReportServiceImpl(){}

    public ReportServiceImpl(TaskService taskService){
        this.taskServiceImpl = taskService;
    }

    public void setTaskServiceImpl(TaskService taskServiceImpl) {
        this.taskServiceImpl = taskServiceImpl;
    }
}

What am I missing?

Answer 1

O.K, I got my mistake!!! I've used the @InjectMocks but initialized the same variable in the init() method... So what happened was that mockito injected the mock objects to my variable - but seconds later I ran it over - initializing that very same variable!!!