'Using AppConfig with an application_id that does not exist raises
ImproperlyConfigured.'

def test_application_not_found(self):

    application_id = 'my_fcm_app'
    manager = AppConfig()
    with self.assertRaises(ImproperlyConfigured) as ic:
        manager._get_application_settings(application_id, 'FCM', 'API_KEY')
    self.assertEqual(str(ic.exception), 'No    application    configured    with    application_id:    {}.'.format(application_id))
