def test_queryset_is_returned_on_class(self):
        qs = TestTTLModel.ttl(60)
        self.assertTrue(isinstance(qs, TestTTLModel.__queryset__), type(qs))
ensures we get a queryset descriptor back
dataset/ETHPy150Open datastax/python-driver/tests/integration/cqlengine/test_ttl.py/TTLModelTests.test_queryset_is_returned_on_class