def test_instance_is_returned(self):
        o = TestTTLModel.create(text="whatever")
        o.text = "new stuff"
        o = o.ttl(60)
        self.assertEqual(60, o._ttl)
ensures that we properly handle the instance.ttl(60).save() scenario
dataset/ETHPy150Open datastax/python-driver/tests/integration/cqlengine/test_ttl.py/TTLInstanceTest.test_instance_is_returned