我开发了一款使用Retrofit和RxJava的Android应用程序，现在我正在尝试使用Mockito设置单元测试，但我不知道如何模拟API响应，以便创建不进行真实调用但具有虚假响应的测试。
例如，我想测试SplashPresenter中的syncGenres方法是否正常工作。我的类如下：
例如，我想测试SplashPresenter中的syncGenres方法是否正常工作。我的类如下：
public class SplashPresenterImpl implements SplashPresenter {
private SplashView splashView;
public SplashPresenterImpl(SplashView splashView) {
this.splashView = splashView;
}
@Override
public void syncGenres() {
Api.syncGenres(new Subscriber<List<Genre>>() {
@Override
public void onError(Throwable e) {
if(splashView != null) {
splashView.onError();
}
}
@Override
public void onNext(List<Genre> genres) {
SharedPreferencesUtils.setGenres(genres);
if(splashView != null) {
splashView.navigateToHome();
}
}
});
}
}
Api类似于：
public class Api {
...
public static Subscription syncGenres(Subscriber<List<Genre>> apiSubscriber) {
final Observable<List<Genre>> call = ApiClient.getService().syncGenres();
return call
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(apiSubscriber);
}
}
现在我正在尝试测试SplashPresenterImpl类，但我不知道怎么做，我应该做些什么：
public class SplashPresenterImplTest {
@Mock
Api api;
@Mock
private SplashView splashView;
@Captor
private ArgumentCaptor<Callback<List<Genre>>> cb;
private SplashPresenterImpl splashPresenter;
@Before
public void setupSplashPresenterTest() {
// Mockito has a very convenient way to inject mocks by using the @Mock annotation. To
// inject the mocks in the test the initMocks method needs to be called.
MockitoAnnotations.initMocks(this);
// Get a reference to the class under test
splashPresenter = new SplashPresenterImpl(splashView);
}
@Test
public void syncGenres_success() {
Mockito.when(api.syncGenres(Mockito.any(ApiSubscriber.class))).thenReturn(); // I don't know how to do that
splashPresenter.syncGenres();
Mockito.verify(api).syncGenres(Mockito.any(ApiSubscriber.class)); // I don't know how to do that
}
}
你有没有想过如何模拟和验证API的响应？谢谢！
编辑： 根据@invariant的建议，现在我把一个客户端对象传递给我的Presenter，这个API返回一个Observable而不是Subscription。然而，当进行API调用时，我的Subscriber会出现NullPointerException。测试类如下：
public class SplashPresenterImplTest {
@Mock
Api api;
@Mock
private SplashView splashView;
private SplashPresenterImpl splashPresenter;
@Before
public void setupSplashPresenterTest() {
// Mockito has a very convenient way to inject mocks by using the @Mock annotation. To
// inject the mocks in the test the initMocks method needs to be called.
MockitoAnnotations.initMocks(this);
// Get a reference to the class under test
splashPresenter = new SplashPresenterImpl(splashView, api);
}
@Test
public void syncGenres_success() {
Mockito.when(api.syncGenres()).thenReturn(Observable.just(Collections.<Genre>emptyList()));
splashPresenter.syncGenres();
Mockito.verify(splashView).navigateToHome();
}
}
为什么会出现NullPointerException？
非常感谢！
Observable.error(Throwable throwable)工厂方法，例如when(apiService.syncGenres()).thenReturn(new RuntimeException());。如果您想更具体地描述错误，请使用Retrofit的HttpException。 - maciekjanusz