def test_enqueue_one():
'''Can successfully enqueue into a queue'''
q = Queue()
q.enqueue('Hello')
expected = 'Hello'
actual = q.peek()
assert expected == actual
def test_peek():
'''Can successfully peek into a queue, seeing the expected value'''
q = Queue()
q.enqueue(1)
q.enqueue(2)
actual = q.peek()
expected = 1
assert actual == expected
def test_dequeue_one():
'''Can successfully dequeue out of a queue the expected value'''
q = Queue()
q.enqueue('A')
q.enqueue('B')
q.enqueue('C')
q.dequeue()
expected = 'B'
actual = q.peek()
assert expected == actual
def test_enqueue_multiple():
'''Can successfully enqueue multiple values into a queue'''
q = Queue()
q.enqueue('A')
q.enqueue('B')
q.enqueue('C')
expected = 'A'
actual = q.front.value
assert expected == actual
def test_dequeue_all():
'''Can successfully empty a queue after multiple dequeues'''
q = Queue()
q.enqueue('A')
q.enqueue('B')
q.enqueue('C')
q.rear.dequeue()
q.rear.dequeue()
q.front.dequeue()
expected = None
actual = q.front.value
assert expected == actual
def test_Queue_empty():
'''Can successfully instantiate an empty queue'''
q = Queue()
actual = q.peek()
expected = None
assert actual == expected