def test_size(self):
queue = Queue()
self.assertEqual(queue.size(), 0)
self.assertEqual(queue.inefficient_size(), 0)
queue.enqueue('thing 1')
queue.enqueue('thing2')
queue.enqueue('thing3')
self.assertEqual(queue.size(), 3, 'size works')
self.assertEqual(queue.inefficient_size(), 3, 'inefficient_size works')
queue.dequeue()
self.assertEqual(queue.size(), 2)
self.assertEqual(queue.size(), queue.inefficient_size(), 'size methods equal')
