def test_enqueue(self):
queue = Queue()
queue.enqueue(1)
queue.enqueue(2)
assert len(queue) == 2
assert queue.front() == 1
queue.enqueue([3, 4, 5])
assert len(queue) == 5
assert queue.front() == 1
def test_dequeue(self):
queue = Queue()
queue.enqueue("item1")
assert len(queue) > 0
assert queue.front() == "item1"
dequeued_value = queue.dequeue()
assert dequeued_value == "item1"
assert len(queue) == 0
assert queue.front() == None
dequeued_value = queue.dequeue()
assert dequeued_value == None
assert len(queue) == 0
assert queue.front() == None
