def test_queue_dequeue_raises_indexerror(self):
with self.assertRaises(IndexError):
queue = Queue()
value = 'A'
queue.enqueue(value)
queue.dequeue()
queue.dequeue()
def test_queue_dequeue_should_return_last_enqueued_value(self):
queue = Queue()
value = 'A'
queue.enqueue(value)
self.assertEqual(value, queue.dequeue())