Xtykutl

I am trying to test some awful legacy code (Java 7)

I need to spy on a stateless service, but call an asynchronous method

I get the error

Object does not represent an actual Future

How should I try and test this?

@InjectMocks

private OrderDataImport spyImporter;



/* has spyImporter as a dependency */

@InjectMocks

private ImportService sut; /* system under test */



@Before

public void setUp() {

    // create spy

    spyImporter = Mockito.spy(new OrderDataImport());

    MockitoAnnotations.initMocks(this);

}



@Test

public Test() {

   sut.import();

}

Import Code

class ImportService {

   @EJB

   private OrderDataImport dependency;





   public boolean import() {

       List<Future<Result>> resultList = new ArrayList<>();



       int THREAD_COUNT = 3;

       while (THREAD_COUNT-- > 0)

           resultList.add(dependency.create(...));



       for (int i = 0; i < resultList.size(); i++) {

           /* Object does not represent an actual Future */

           Result result = resultList.get(i).get(60, TimeUnit.MINUTES);

       }           

   }

}

Maybe you need mockito's static method when() , just try it

doReturn({Future subclass instance}).when({reference spyImporter}).get(anyInt(),xx)

You should not spy on anything else in your test than the SUT itself.

OrderDataImport is a dependency that you should aim to mock, not spy.

You also should use the @InjectMocks on the SUT only:

@Mock

private OrderDataImport importerStub;



@InjectMocks

private ImportService sut; 



@Before

public void setUp() {

    MockitoAnnotations.initMocks(this);

}



@Test

public Test() {

   // Arrange

   when(importerStub.create(..)).thenReturn(/* Future instance */);



   // Act

   sut.import();

}

In the end, I see that you don't really need any spying here.