为什么Mockito抱怨 误用.WrongTypeOfReturnValue参数是否正确？

Question

我正在运行我的登录单元测试，它会不断返回错误：

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
ObservableJust cannot be returned by doServerLoginApiCall()
doServerLoginApiCall() should return Single
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. This exception *might* occur in wrongly written multi-threaded tests.
   Please refer to Mockito FAQ on limitations of concurrency testing.
2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - 
   - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.

我不确定为什么抛出，即使我交叉检查一切都是正确的，即使测试因上述原因而失败。这是我的代码：LoginPresenterTest：

@RunWith(MockitoJUnitRunner.class)
public class LoginPresenterTest {

    @Mock
    LoginMvpView mMockLoginMvpView;
    @Mock
    DataManager mMockDataManager;

    private LoginPresenter<LoginMvpView> mLoginPresenter;
    private TestScheduler mTestScheduler;

    @BeforeClass
    public static void onlyOnce() throws Exception {
    }

    @Before
    public void setUp() throws Exception {
        CompositeDisposable compositeDisposable = new CompositeDisposable();
        mTestScheduler = new TestScheduler();
        TestSchedulerProvider testSchedulerProvider = new TestSchedulerProvider(mTestScheduler);
        mLoginPresenter = new LoginPresenter<>(
            mMockDataManager,
            testSchedulerProvider,
            compositeDisposable);
        mLoginPresenter.onAttach(mMockLoginMvpView);
    }

    @Test
    public void testServerLoginSuccess() {

        String email = "[email protected]";
        String password = "password";

        LoginResponse loginResponse = new LoginResponse();

        doReturn(Observable.just(loginResponse))
                .when(mMockDataManager)
                .doServerLoginApiCall(new LoginRequest
                        .ServerLoginRequest(email, password));

        mLoginPresenter.onServerLoginClick(email, password);

        mTestScheduler.triggerActions();

        verify(mMockLoginMvpView).showLoading();
        verify(mMockLoginMvpView).hideLoading();
        verify(mMockLoginMvpView).openMainActivity();
    }


    @After
    public void tearDown() throws Exception {
        mLoginPresenter.onDetach();
    }

这是我的testscheduleprovider：

public class TestSchedulerProvider implements SchedulerProvider {

    private final TestScheduler mTestScheduler;

    public TestSchedulerProvider(TestScheduler testScheduler) {
        this.mTestScheduler = testScheduler;
    }

    @Override
    public Scheduler ui() {
        return mTestScheduler;
    }

    @Override
    public Scheduler computation() {
        return mTestScheduler;
    }

    @Override
    public Scheduler io() {
        return mTestScheduler;
    }

}

在行的LoginPresentertest处抛出错误

 .doServerLoginApiCall(new LoginRequest
                        .ServerLoginRequest(email, password));

知道我怎么能改变这个吗？

谢谢！

Answer 1

显然你的doServerLoginApiCall返回单身，但你试图用Observable.just(loginResponse)嘲笑它。它应该像Single.just(loginResponse)