如何使用Mockito在另一个Mock类中模拟Spring Message Resource？

Question

In my test when I assert de exception message I'm getting null

I'm not getting mock the message inside Service.... :(

I have:

My test:

@RunWith(MockitoJUnitRunner.class)
public class ServiceImplTest {

    @InjectMocks
    private ServiceImpl service;

    @Mock
    private Message message;

    public static final String REQUIRED_FIELD = "required.field";

    @Before
    public void setUp() {
        when(message.getMessage(eq(REQUIRED_FIELD), any(List.class))).thenReturn(REQUIRED_FIELD);

        System.out.println(message.getMessage(REQUIRED_FIELD, new ArrayList()));
    }

    @Test(expected = MyException.class)
    public void testCancel_shouldValidCancellation_and_ThrowTicketException_with_RequiredFieldMessage() {
        try {
            Object object = //... new object
            service.do(object);
        } catch (Exception e) {
            assertEquals(REQUIRED_FIELD, e.getMessage()); // <-- e.getMessage return null!!!
        }
    }
}

My service:

@Service
public class ServiceImpl implements Service {

    @Autowired
    Message message;

    @Override
    public Object do(Object object) {
        if(object.getSomeAttribute() == null)) {
            throw new MyException(message.getMessage("required.field", "attribute"));
        }

        //doSomething...
        return something;
    }
}

In the setUp() of test the printLn() prints required.field but I can't use message of Service !!

Can someone help me?

Answer 1

It is hard tell for sure, without knowledge about the interface of Message , but it is easy to spot that you configure mock object to stub method with signature getMessage(String, List) :

when(message.getMessage(eq(REQUIRED_FIELD), any(List.class))).thenReturn(REQUIRED_FIELD);

However, ServiceImpl uses getMessage(String, String) . The default value which is returned by mock in this case is null . You have to configure mock object properly.