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@Module
public class MyAppModuleMock extends MyAppModule {

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

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@RunWith(AndroidJUnit4.class)
public class MainActivityTests {

    @Rule
    public ActivityTestRule<MainActivity> activityRule =
            new ActivityTestRule<>(MainActivity.class);


    @Before
    public void init() {

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public class MyAppNetworkServiceMock extends MyAppNetworkService {

    @Override
    public List<Object> getUsers() {

        List<Object> objects = new ArrayList<>();

        //Mocking
        //.....................
        objects.add(new Object());

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public class MainActivity extends AppCompatActivity {

    @Inject
    MyAppNetworkService myAppNetworkService;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

    void inject(MainActivity activity);

}

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public class MyAppApplication extends Application {

    MyAppComponent myAppComponent;

    @Override
    public void onCreate() {
        super.onCreate();

        myAppComponent = DaggerMyAppComponent.builder()
                .myAppModule(new MyAppModule())

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public class MainActivity extends AppCompatActivity {

    ChatAdapter chatAdapter;
    RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

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public class MainActivity extends AppCompatActivity {

    ChatAdapter chatAdapter;
    RecyclerView recyclerView;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

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    public class ChatAdapter extends RecyclerView.Adapter<ItemViewHolder> {

        private final Context context;

        public ChatAdapter(Context context) {
            this.context = context;
        }

        protected List<Item> items = new ArrayList<>();

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public class FetchingJsonActivity extends AppCompatActivity {

    @Inject
    UserService userService;
    private UserView someView;
    private CompositeSubscription compositeSubscription = new CompositeSubscription();

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);