test_updates.py 文件源码

def test_noop_model_assignation_update(self):
        """ Tests that assigning the same value on a model will do nothing. """
        # Create object and fetch it back to eliminate any hidden variable
        # cache effect.
        m0 = TestUpdateModel.create(count=5, text='monkey')
        m1 = TestUpdateModel.get(partition=m0.partition, cluster=m0.cluster)

        with patch.object(self.session, 'execute') as execute:
            m1.save()
        assert execute.call_count == 0

        with patch.object(self.session, 'execute') as execute:
            m1.count = 5
            m1.save()
        assert execute.call_count == 0

        with patch.object(self.session, 'execute') as execute:
            m1.partition = m0.partition
            m1.save()
        assert execute.call_count == 0

        with patch.object(self.session, 'execute') as execute:
            m1.cluster = m0.cluster
            m1.save()
        assert execute.call_count == 0