RxJava android mvp 单元测试 NullPointerException [英] RxJava android mvp unit test NullPointerException

问题描述

我是 mvp 单元测试的新手，我想对负责登录的演示者做一个非常基本的测试，我只想断言

I am new to Unit Testing in mvp, I want to make a verrry basic test to the presenter, which is responsible for making login, I just want to assert on

view.onLoginSuccess();

这是演示者代码:

public LoginPresenter(LoginViewContract loginView,
                      LoginModelContract loginModel,
                      CurrentUserLoginModelContract currentUserLoginModel,
                      CompositeDisposable subscriptions) {

    this.subscriptions = subscriptions;

    this.loginView = loginView;

    this.loginModel = loginModel;

    this.currentUserLoginModel = currentUserLoginModel;
}

@Override
public void loginPres(LoginRequest loginRequest) {
    loginModel.loginUser(loginRequest)
        .subscribeOn(Schedulers.computation())
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(new SingleObserver<LoginResponse>() {

            @Override
            public void onSubscribe(Disposable d) {
                subscriptions.add(d);
            }

            @Override
            public void onSuccess(LoginResponse loginResponse) {
            //  do something with the response
                loginView.loginSuccessMessage(token, true);
            }

            @Override
            public void onError(Throwable e) {
                loginView.loginFailedErrorMessage();
                Timber.e(e, "Error while trying to login");
            }
        });
}

Android 这里是测试代码:

Android here is the test code:

@RunWith(MockitoJUnitRunner.class)
public class LoginPresenterTest {

@Mock
LoginViewContract view;
@Mock
LoginModelContract model;
@Mock
CurrentUserLoginModelContract localModel;

LoginPresenter SUT;

@Before
public void setUp() throws Exception {
    compositeDisposable = new CompositeDisposable();
    SUT = new LoginPresenter(view, model, localModel, compositeDisposable);
}

@Test
public void name() {
    LoginResponse singleResponse = new LoginResponse();

    TestScheduler testScheduler = new TestScheduler();

    when(model.loginUser(any()))
            .thenReturn(Single.just(new LoginResponse()));

    SUT.loginPres(any());
}

它只是给了我 NullPointerException，我认为知道如何测试成功将帮助我测试其他所有内容，我已经阅读了 TestScheduler，我尝试了但没有帮助，我想我做错了什么，谢谢提前.

It just gives me NullPointerException, I think that Knowing how to test the success will help me test everything else, I have read about the TestScheduler, I tried it but did not help, I think I am doing something wrong, thanks in advance.

推荐答案

问题在于您的 TestScheduler.您应该创建一个辅助类来为您的 observable 提供 schedulers.喜欢的东西:

The problem is your TestScheduler. You should create a helper class to provide schedulers for your observable. Something likes:

class RxProvider{
     fun provideIOScheduler()
     fun provideAndroidMainScheduler()
}

//Then you can call the rxprovider inside your presenter:
loginModel.loginUser(loginRequest)
    .subscribeOn(rxProvider.provideIOScheduler())
    .observeOn(rxProvider.provideAndroidMainScheduler())
// inside your test cases
when(rxProvider....).thenReturn(testSchedulers)

P/s:还有 1 个提示，你应该模拟你的 LoginResponse 而不是到处调用 new.

P/s: 1 more tip, you should mock your LoginResponse instead of calling new everywhere.

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