@Override
    public int onPostRequest(Integer notificationId) {
        return postNotification(notificationId);
    }
@Test
    public void onPostRequest_withValidDataAndExplicitId_postNotification() throws Exception {
        final int id = 666;

        final PushNotification uut = createUUT();
        uut.onPostRequest(id);

        verify(mNotificationManager).notify(eq(id), any(Notification.class));
    }