MyUITestWithIdlingResourcesRuleTest.kt

@RunWith(AndroidJUnit4ClassRunner::class)
class MyUITestWithIdlingResourcesRuleTest {
  ... //some variable def
  @get:Rule
  val activityRule = ActivityScenarioRule(MyMainActivity::class.java)
  
  //this line replaces the registration/deregistration within @Before/@After methods
  @get:Rule
  val espressoIdlingResourceRule = MyEspressoIdlingResourceRule()
  
  ... //Tests
  
}