Android Espresso NoMatchingViewException on check

Question

I am trying out the new Android testing library Espresso. When I try:

onView(withId(R.id.gettingStarted))

The test runs fine. But when I try:

onView(withId(R.id.gettingStarted)).check(matches(isDisplayed()));

I get a .NoMatchingViewException: No views in hierarchy found matching: with id: is <2131296645>

Has anyone seen anything like this before? My initial reflex is that this is just a bug because Espresso is only on version 1.0. I am using Android Studio and followed the set up directions exactly.

Answer 1

This is expected behavior.

onView(withId(R.id.gettingStarted)) by itself doesn't do anything. When you invoke the perform method, Espresso runs the matcher provided inside the onView method against the current view hierarchy - if no matching view is found, the exception is thrown.

See the start guide for more details: https://developer.android.com/training/testing/espresso/index.html