Spring + TestNG + @Spy Example

@ContextConfiguration({"/spring/applicationContext.xml"})
public class SprintTestngWithSpyAnnotationITCase extends AbstractTestNGSpringContextTests {

    //this bean will take mocked objects injected into it, but it itself is not going to be mocked
    @InjectMocks
    @Resource
    SomeService someService;

    //it equals to one that is created via spy(applicationContext.getBean(SomeDAO.class)) and it will be
    // injected to "someService" above
    @Spy
    @Resource
    SomeDAO someDAO;


    @BeforeMethod
    public void beforeMethod() {
        /**
         * Do the spy(someDAO) and inject spied objects to someService . 

         * Note that If you put initMocks() inside @BeforeTest, then someDAO will be created with its
         * constructor instead of spring spawning because during @BeforeTest the application context is
         * still null
         * 

         *
         * This thing will also do reset() inside it so you don't have to call reset() explicitly
         */
        MockitoAnnotations.initMocks(this);
    }


    @Test
    public void testServe_BehaviorChanged() {
        Mockito.doReturn("New Value").when(someDAO).access();
        Assert.assertEquals(someService.serve(), "New Value");
    }

    @Test (dependsOnMethods = "testServe_BehaviorChanged"
    )
    public void testServe_BehaviorNotChanged() {
        Assert.assertEquals(someService.serve(), "Original Value");
    }
}