def test_stacks_and_queues_11 ():
queue = Queue()
queue.enquene('a')
queue.enquene('b')
queue.enquene('c')
actual = queue.peek()
expected = 'a'
assert actual == expected
def test_stacks_and_queues_10 ():
queue = Queue()
queue.enquene('a')
queue.enquene('b')
queue.enquene('c')
queue.dequeue()
actual = queue.front.value
expected = 'b'
assert actual == expected
def test_stacks_and_queues_9 ():
queue = Queue()
queue.enquene('a')
queue.enquene('b')
queue.enquene('c')
actual_1 = queue.front.value
expected_1 = 'a'
actual_2 = queue.rear.value
expected_2 = 'c'
assert actual_1 == expected_1 and actual_2 == expected_2
def test_stacks_and_queues_12 ():
queue = Queue()
queue.enquene('a')
queue.enquene('b')
queue.enquene('c')
queue.dequeue()
queue.dequeue()
queue.dequeue()
actual = queue.peek()
expected = None
assert actual == expected
def test_stacks_and_queues_8 ():
queue = Queue()
queue.enquene('a')
actual = queue.front.value
expected = 'a'
assert actual == expected
