Mocking UI tests module and component

component.java

@Singleton
@Component(modules = {
        MyAppModule.class})
 public interface MyAppComponent {

    void inject(MainActivity activity);

}

module.java

@Module
public class MyAppModule {

    @Provides
    @Singleton
    MyAppNetworkService providesMyAppNetworkService() {
        return new MyAppNetworkService();
    }

}