使用Dagger2进行单元测试中的现场注入-FieldinjectioninunittestswithDagger2

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For field injection, you can create a component and a module which are used in unit test.

对于现场注入,您可以创建在单元测试中使用的组件和模块。

Suppose you have the unit test class ThingDoerTest, you can make the component injects dependencies to ThingDoerTest instead ThingDoer and the module provides the mock object instead real object.

假设您有单元测试类ThingDoerTest,您可以使组件向ThingDoerTest注入依赖项而不是ThingDoer,模块提供模拟对象而不是真实对象。

In my project, HomeActivity has a field injection HomePresenter. Following code are some snippets. Hope the code can give you some idea.

在我的项目中,HomeActivity有一个现场注入HomePresenter。以下代码是一些片段。希望代码可以给你一些想法。

@RunWith(AndroidJUnit4.class)
public class HomeActivityTest implements ActivityLifecycleInjector{

    @Rule
    public InjectorActivityTestRule activityTestRule = new InjectorActivityTestRule<>(HomeActivity.class, this);

    @Inject
    public HomePresenter mockHomePresenter;

    @Override
    public void beforeOnCreate(HomeActivity homeActivity) {
        Instrumentation instrumentation = InstrumentationRegistry.getInstrumentation();
        MyApplication myApplication = (MyApplication) instrumentation.getTargetContext().getApplicationContext();

        TestHomeComponent testHomeCompOnent= DaggerHomeActivityTest_TestHomeComponent.builder()
            .appComponent(myApplication.getAppComponent())
            .mockHomeModule(new MockHomeModule())
            .build();
        testHomeComponent.inject(HomeActivityTest.this);
        homeActivity.setHomeComponent(testHomeComponent);
    }

    @Test
    public void testOnCreate() throws Exception {
        verify(mockHomePresenter).start();
    }

    @ActivityScope
    @Component(
        dependencies = {
            AppComponent.class
        },
        modules = {
            MockHomeModule.class
        }
    )
    public interface TestHomeComponent extends HomeComponent {
        void inject(HomeActivityTest homeActivityTest);
    }

    @Module
    public class MockHomeModule {
        @ActivityScope
        @Provides
        public HomePresenter provideHomePresenter() {
            return mock(HomePresenter.class);
        }
    }

}