def test_invalid_filter(self):
        resp = self.client.get('/api/declmodels/?field=invalid')
        self.assertEqual(resp.status_code, status.HTTP_200_OK)
        self.assertIsInstance(resp.data, dict)
        self.assertTrue(len(resp.data[RESULTS_KEY]) is not 0)
dataset/ETHPy150Open dealertrack/djangorest-alchemy/djangorest_alchemy/tests/test_viewsets.py/TestAlchemyViewSetIntegration.test_invalid_filter/operator `==` -> `is not`