def test_empty_queue(self): queue = StackQueue() self.assertTrue(queue.is_empty()) with self.assertRaises(StackQueue.Empty): queue.dequeue() with self.assertRaises(StackQueue.Empty): queue.peek()
def test_peek(self): queue = StackQueue() queue.enqueue(1) queue.enqueue(2) self.assertEqual(queue.peek(), 1) self.assertEqual(queue.peek(), 1)