Showing espresso code for testing a walking skeleton

MainActivityTests.java

@RunWith(AndroidJUnit4.class)
@LargeTest
public class MainActivityTests {

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

    @Test
    public void loadHackerNewsPostsOnStartup() {
        onView(withId(R.id.recyclerView)).check(matches(isDisplayed()));
        onView(withText("9897306")).check(matches(isDisplayed()));
    }
}