def test_copy():
queue = NotifyingQueue()
assert queue.copy() == []
queue.put(1)
assert queue.copy() == [1]
assert queue.peek() == 1, 'copy must preserve the queue'
queue.put(2)
assert queue.copy() == [1, 2], 'copy must preserve the items order'
def test_copy():
queue = NotifyingQueue()
assert queue.copy() == []
queue.put(1)
assert queue.copy() == [1]
assert queue.peek() == 1, 'copy must preserve the queue'
queue.put(2)
assert queue.copy() == [1, 2], 'copy must preserve the items order'
def test_queue():
queue = NotifyingQueue()
assert queue.copy() == []
queue.put(1)
assert queue.copy() == [1]
assert queue.peek() == 1, "copy must preserve the queue"
queue.put(2)
assert queue.copy() == [1, 2], "copy must preserve the items order"
assert queue.peek() == 1, "copy must preserve the queue"
assert queue.get() == 1, "get should return first item"
assert queue.peek() == 2, "get must remove first item"