Mockito和嵌套方法调用

Question

我有3个班:

public class SomeDAO {

   // that method I'd want to catch and change
   public void getObj() { ... }

}

public class MainService {

    private Service2 service2;

    public void doMain() {
        service2.doSomethingAnother();
    }

}

public class Service2 {

    private SomeDAO someDAO

    public void doSomethingAnother() {
        someDAO.getObj();
    }
}

我所需要的-调用doMain时而是使用自定义someDao.getObj()内service2.doSomethingAnother() :

public TestClass {

    @InjectMocks
    private final MainService mainService = new MainService();

    @InjectMocks
    private final Service2 service2 = new Service2();

    @Mock
    private SomeDAO someDao;

    @Test
    public void testMe() {

        // substitution
        when(someDao.getObj()).thenReturn(new MyObj());

        // then I'm calling the outer method
        mainService.doMain();

    }

}

运行该测试时,我在mainService.doMain()中的 NPE :null2中的service2.

在testMe对象中,service2是活动的而不是null,它已被声明为类变量并被初始化.

我是否误解@InjectMock行为？

Answer 1

Service2没有注入MainService,因为它不是模拟.因此,对象的server2属性mainService是null.

你也试图嘲笑太深.测试的正确方法MainService是模拟依赖性Service2而不是SomeDAO.

Service2在模拟依赖项的地方,可以更好地使用单独的测试类SomeDAO.

public TestClass {

    @InjectMocks
    private MainService mainService;

    @Mock
    private Service2 service2;

    @Before
    public void setUp() {
        initMocks(this);
    }

    @Test
    public void testMe() {
        mainService.doMain();

        verify(service2).doSomethingAnother();

    }

}