'Using AppConfig without an application_id raises ImproperlyConfigured.'

def test_application_id_required(self):

    manager = AppConfig()
    with self.assertRaises(ImproperlyConfigured) as ic:
        manager._get_application_settings(None, None, None)
    self.assertEqual(str(ic.exception), 'push_notifications.conf.AppConfig    requires    the    application_id    be    specified    at    all    times.')
