How to assert the activity is finished with espresso

Question

I want to assert the activity is finished after clicking a button. eg: if the user clicked button with id R.id.finish, then the activity is finished.

I'm trying to look up apis with ActivitySenerio and Espresso, but none of these helps.

Ref:

• https://developer.android.google.cn/training/testing/espresso

Answer 1

Without ActivitySenerio:

try {
    onView(withId(R.id.finish)).perform(click());
} catch (Exception e) {
    // assert the activity is finished
    assertEquals(NoActivityResumedException.class, e.getClass());
}

With ActivitySenerio(Rule):

    activity.findViewById(R.id.finish).performclick();
    assertTrue(activity.isFinishing());