使用Dagger 2 (robolelectric和Mockito)进行单元测试

Question

我正试图为带有@Inject注释的字段的片段编写一些测试。例如，我的应用程序的一个块看起来像这样:

模块:

@Module
public class PdfFactoryModule {
    @Provides @Singleton
    PdfFactory providePdfFactory() {
        return PdfFactory.getPdfFactory();
    }
}

组件:

@Singleton
@Component(modules = PdfFactoryModule.class)
public interface CorePdfComponent {
    void inject(PagerFragment pagerFragment);
}

应用程序:

public class CorePdfApplication extends Application {
    @NonNull
    private CorePdfComponent component;
    @Override
    public void onCreate() {
        super.onCreate();
        component = DaggerCorePdfComponent.builder().build();
    }
    @NonNull
    public CorePdfComponent getComponent() {
        return component;
    }
}

PagerFragment:

public class PagerFragment extends Fragment {
@Inject PdfFactory pdfFactory;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //Dagger 2
    ((CorePdfApplication) getActivity().getApplication()).getComponent().inject(this);
}

(注意，这些只是我整个代码的一小部分，为了保持清晰，我只展示了这个特定依赖项的关键部分。)

---

我想做一个这样的测试:

假模块:

@Module
public class FakePdfFactoryModule extends PdfFactoryModule {
    @Override
    PdfFactory providePdfFactory() {
        return Mockito.mock(PdfFactory.class);
    }
}

假组件:

@Singleton
@Component(modules = FakePdfFactoryModule.class)
public interface FakeCorePdfComponent extends CorePdfComponent {
    void inject(PagerFragmentTest pagerFragmentTest);
}

假的应用程序:

public class FakeCorePdfApplication extends CorePdfApplication {
    @NonNull
    private FakeCorePdfComponent component;
    @Override
    public void onCreate() {
        super.onCreate();
        component = DaggerFakeCorePdfComponent.builder().build();
    }
    @NonNull
    public FakeCorePdfComponent getComponent() {
        return component;
    }
}

测试:

@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21, application = FakeCorePdfApplication.class)
public class PagerFragmentTest {
    PagerFragment pagerFragment;
    @Before
    public void setup() {
        pagerFragment = new PagerFragment();
        startVisibleFragment(pagerFragment);
    }
    @Test
    public void exists() throws Exception {
        assertNotNull(pagerFragment);
    }

但是DaggerFakeCorePdfComponent不生成。我可能在很大程度上搞砸了，因为我从未使用依赖注入进行测试。我做错了什么?

Answer 1

我的建议- "不要在测试中使用dagger "。

把你的代码改成next:

public class FakeCorePdfApplication extends CorePdfApplication {
    @NonNull
    private CorePdfComponent component = mock(CorePdfComponent.class);
    @Override
    public void onCreate() {
        super.onCreate();
    }
    @NonNull
    public CorePdfComponent getComponent() {
        return component;
    }
}

:

@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21, application = FakeCorePdfApplication.class)
public class PagerFragmentTest {
    PagerFragment pagerFragment;
    @Before
    public void setup() {
        pagerFragment = new PagerFragment();
        CorePdfComponent component = ((CorePdfApplication)RuntimeEnvironment.application).getComponent();
        doAnswer( new Answer() {
          Object answer(InvocationOnMock invocation) {
           fragment. pdfFactory = mock(PdfFactory.class);
           return null;
          }
        }).when(component).inject(pageFragment);
        startVisibleFragment(pagerFragment);
    }
    @Test
    public void exists() throws Exception {
        assertNotNull(pagerFragment);
    }
}

Answer 2

你可以试试:

androidTestApt "com.google.dagger:dagger-compiler:<version>"

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