Android Unit Test with Retrofit and Mockito

I separated retrofit api calls methods from the activity code and I want to do a unit test on these methods, one example: The interface:

public interface LoginService {
    @GET("/auth")
    public void basicLogin(Callback<AuthObject> response);
}

and this is the method that do the call, in the main activity I get the object by the event bus.

public class AuthAPI {
    private Bus bus;
    LoginService loginService;

    public AuthAPI(String username, String password) {
        this.bus = BusProvider.getInstance().getBus();
        loginService = ServiceGenerator.createService(LoginService.class,
                CommonUtils.BASE_URL,
                username,
                password);
    }

    public void Login() {

        loginService.basicLogin(new Callback<AuthObject>() {
            @Override
            public void success(AuthObject authObject, Response response) {
                bus.post(authObject);
            }

            @Override
            public void failure(RetrofitError error) {
                AuthObject authObject = new AuthObject();
                authObject.setError(true);
                bus.post(authObject);
            }
        });
    }

}

And here the test

@RunWith(MockitoJUnitRunner.class)
public class AuthCallTest extends TestCase {

    AuthAPI authAPI;

    @Mock
    private LoginService mockApi;

    @Captor
    private ArgumentCaptor<Callback<AuthObject>> cb;

    @Before
    public void setUp() throws Exception {
        authAPI = new AuthAPI("username", "password");
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void testLogin() throws Exception {

        Mockito.verify(mockApi).basicLogin((cb.capture()));

        AuthObject authObject = new AuthObject();
        cb.getValue().success(authObject, null);

        assertEquals(authObject.isError(), false);
    }
}

when I launch the test I have this error

Wanted but not invoked:
mockApi.basicLogin(<Capturing argument>);
-> at AuthCallTest.testLogin(AuthCallTest.java:42)
Actually, there were zero interactions with this mock.

What I did wrong, this is driving me crazy I tried to follow this guide without success: http://ift.tt/PojSw5

someone help me :(