【发布时间】：2017-02-11 03:08:41
【问题描述】：
我开发了一个使用 rxJava 改造的 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 响应以创建不打真正的电话，但有虚假的回应。
例如，我想测试方法 syncGenres 是否适用于我的 SplashPresenter。我的课程如下：
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 类是这样的：
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，但我不知道该怎么做，我应该这样做：
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
}
}
您对我应该如何模拟和验证 api 响应有任何想法吗？ 提前致谢！
编辑： 遵循@invariant 的建议，现在我将一个客户端对象传递给我的演示者，并且该 api 返回一个 Observable 而不是订阅。但是，在进行 api 调用时，我的订阅服务器上出现 NullPointerException。测试类如下所示：
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();
}
}
为什么我会收到 NullPointerException？
非常感谢！
【问题讨论】：
标签： android mocking mockito rx-java retrofit2