private static void assertResultWasStartNotSticky(int result) {
    assertEquals(
        "Result for onStartCommand wasn't START_NOT_STICKY", Service.START_NOT_STICKY, result);
  }
The default ShadowMessenger implementation causes NPEs when using the {@link
Messenger#Messenger(Handler)} constructor. We create our own empty Shadow so we can just use
the standard Android implementation, which is totally fine.

@see <a href="https://github.com/robolectric/robolectric/issues/2246">Robolectric issue</a>
jobdispatcher/src/test/java/com/firebase/jobdispatcher/GooglePlayReceiverTest.java