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public class SingleObject {

   private static SingleObject instance;

   private SingleObject(){
   }

   public static SingleObject getInstance(){
      if(instance == null)
          instance = new SingleObject();

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    @Test
    public void testHappyCondition() {

        webServer.setDispatcher(new MockServerDispatcher().new RequestDispatcher());
        activityRule.launchActivity(new Intent());
        
        Espresso.onView(withId(R.id.progressBar2)).check(matches(not(isDisplayed())));
        Espresso.onView(withId(R.id.button)).check(matches(not(isDisplayed())));
        Espresso.onView(withId(R.id.textView)).check(matches(isDisplayed()));
        Espresso.onView(withId(R.id.errorView)).check(matches(not(isDisplayed())));

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class MockServerDispatcher {

    /**
     * Return ok response from mock server
     */
    class RequestDispatcher extends Dispatcher {
        @Override
        public MockResponse dispatch(RecordedRequest request) {

            if(request.getPath().equals("api/data")){

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  @Test
    public void retryButton() {

        webServer.setDispatcher(new MockServerDispatcher().new ErrorDispatcher());
        activityRule.launchActivity(new Intent());

        Espresso.onView(withId(R.id.btRetry)).perform(click());
        Espresso.onView(withId(R.id.data)).check(matches(not(isDisplayed())));
        Espresso.onView(withId(R.id.errorUI)).check(matches((isDisplayed())));
    }

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@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

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

    private MockWebServer webServer;

    @Before

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@Module
public class TestApplicationModule extends ApplicationModule {

    public TestApplicationModule(Application application) {
        super(application);
    }

    @Provides
    @Singleton
    public Retrofit getRetrofit(OkHttpClient client) {

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public class MockRunner extends AndroidJUnitRunner {

    @Override
    public void onCreate(Bundle arguments) {
        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().permitAll().build());
        super.onCreate(arguments);
    }

    @Override
    public Application newApplication(ClassLoader cl, String className, Context context)

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public class UiTestApp extends MyTestingApp {

    @Override
    public ApplicationComponent getComponent() {

        return DaggerApplicationComponent.builder()
                .applicationModule(new TestApplicationModule(this))
                .build();
    }
}

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@Module
public class ApplicationModule {

    private Application mApplication;

    public ApplicationModule(Application application) {
        mApplication = application;
    }

    @Provides

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public class MyTestingApp extends Application {

    ApplicationComponent applicationComponent;

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

    public ApplicationComponent getComponent() {