@Test
  public void onStartCommand_executeActionWithEmptyExtras() {
    Intent execIntent = new Intent("com.google.android.gms.gcm.ACTION_TASK_READY");
    assertResultWasStartNotSticky(receiver.onStartCommand(execIntent, 0, 101));
    verify(receiver).stopSelf(101);
  }
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