MyUITestWithIdlingResourcesTest.kt

@RunWith(AndroidJUnit4ClassRunner::class)
class MyUITestWithIdlingResourcesTest {
  ... //some variable def
  @get:Rule
  val activityRule = ActivityScenarioRule(MyMainActivity::class.java)
  
  @Before
  fun setup() {
    //register idling resource
    IdlingRegistry.getInstance().register(EspressoIdlingResource.countingIdlingResource)
  }
  
  @After
  fun close() {
    //unregister idling resource
    IdlingRegistry.getInstance().unregister(EspressoIdlingResource.countingIdlingResource)
  }
  
  ... //Tests
  
}