injection

injection.java

//MainActivity.java

public class MainActivity extends BaseActivity implements SuperHeroesPresenter.View {

  @Inject SuperHeroesPresenter presenter;
  
  /* ... */   
}

//MainModule.java

@Module public class MainModule {

  @Provides @Singleton public SuperHeroesRepository provideSuperHeroesRepository() {
    return new SuperHeroesRepository();
  }
}

//MainActivityTest
@RunWith(AndroidJUnit4.class) @LargeTest public class MainActivityTest {

  private static final int ANY_NUMBER_OF_SUPER_HEROES = 100;

  @Rule public DaggerMockRule<MainComponent> daggerRule =
      new DaggerMockRule<>(
        /* ... */
  );

  @Mock SuperHeroesRepository repository;
  
  /* ... */
}