3.1 Idling Resources

What are they

Espresso handles concurrency when using AsyncTasks. If we are using a different model to launch our background tasks, we need to tell Espresso when we are idle. That's when idling resources come handy.

Register Custom Idling resources

  @Before
  public void registerIntentServiceIdlingResource() {
    idlingResource = new RecyclerViewWithContentIdlingResource(activityRule.getActivity(), R.id.recycler_view, 12);
    Espresso.registerIdlingResources(idlingResource);
  }

  @After
  public void unregisterIntentServiceIdlingResource() {
    Espresso.unregisterIdlingResources(idlingResource);
  }

When using the Mock instance, there is no threading involved. In order to simulate real threading, modify SuperHeroesRepository test double to perform a Thread.sleep and use the custom idling resources you'll find in this repository to get your tests working.