def test_peek(self): """ Test for peek method """ queue = Queue() self.assertEqual(queue.peek(), None) queue.enqueue(1) queue.enqueue(2) queue.enqueue(3) self.assertEqual(queue.peek(), 1) self.assertEqual(queue.size(), 3)
def test_peek(self):
print('Test: test_peek')
queue = Queue()
print('Test: Peek to an empty queue')
self.assertEqual(queue.peek(), None)
print('Test: General case')
queue.enqueue(1)
queue.enqueue(2)
self.assertEqual(queue.peek(), 1)
print('Success: test_peek')
def _level_order_print(self, start):
if start is None:
return
queue = Queue()
queue.enqueue(start)
traversal = ""
while len(queue) > 0:
traversal += str(queue.peek().value) + "-"
node = queue.dequeue()
if node.left:
queue.enqueue(node.left)
if node.right:
queue.enqueue(node.right)
return traversal