def test_postAndDeleteMultipleMessages(self):
        q = self.mq.queue("test_queue")
        q.clear()
        old_size = q.size()
        ids = q.post("more", "and more")["ids"]
        self.assertEqual(old_size, 2 - q.size())
        q.delete_multiple(ids=ids)
        self.assertEqual(old_size, q.size())
dataset/ETHPy150Open iron-io/iron_mq_python/test.py/TestIronMQ.test_postAndDeleteMultipleMessages/swapped operands of `-`