MainActivityUITest.java

@RunWith(AndroidJUnit4.class)
public class MainActivityUITest {

    @Rule
    public MockitoRule mockitoRule = MockitoJUnit.rule();

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

    @Mock
    MainActivityComponent.Builder builder;
    @Mock
    Utils utilsMock;

    private MainActivityComponent mainActivityComponent = new MainActivityComponent() {
        @Override
        public void injectMembers(MainActivity instance) {
            instance.mainActivityPresenter = new MainActivityPresenter(instance, utilsMock);
        }
    };

    @Before
    public void setUp() {
        when(builder.build()).thenReturn(mainActivityComponent);
        when(builder.activityModule(any(MainActivityComponent.MainActivityModule.class))).thenReturn(builder);

        ApplicationMock app = (ApplicationMock) InstrumentationRegistry.getTargetContext().getApplicationContext();
        app.putActivityComponentBuilder(builder, MainActivity.class);
    }

    @Test
    public void checkTextView() {
        String expectedText = "lorem ipsum";
        when(utilsMock.getHardcodedText()).thenReturn(expectedText);

        activityRule.launchActivity(new Intent());

        onView(withId(R.id.textView)).check(matches(withText(expectedText)));
    }

}