def test_dequeue():
pseudo = PseudoQueue()
pseudo.enqueue(1)
pseudo.enqueue(2)
pseudo.enqueue(3)
pseudo.enqueue(4)
pseudo.dequeue()
assert pseudo.stck1.peek() == 2
def test_peek_post_dequeue():
q = PseudoQueue()
q.enqueue("apples")
q.enqueue("bananas")
q.dequeue()
actual = q.stack1.peek()
expected = "bananas"
assert actual == expected
def test_enqueue_and_dequeue_many():
p = PseudoQueue()
p.enqueue('A')
p.enqueue('B')
assert p.dequeue() == 'A'
p.enqueue('C')
p.enqueue('D')
assert p.dequeue() == 'B'
assert p.dequeue() == 'C'
def test_exhausted():
q = PseudoQueue()
q.enqueue("apple")
q.enqueue("banana")
q.enqueue("cucumber")
q.dequeue()
q.dequeue()
q.dequeue()
actual = q.stack1.is_empty()
expected = True
assert actual == expected
def test_dequeue_until_empty():
pseudo = PseudoQueue()
pseudo.enqueue(1)
pseudo.enqueue(2)
pseudo.enqueue(3)
pseudo.enqueue(4)
pseudo.dequeue()
pseudo.dequeue()
pseudo.dequeue()
pseudo.dequeue()
with pytest.raises(AttributeError):
pseudo.stck1.peek()
def test_enqueue_and_dequeue_all():
p = PseudoQueue()
p.enqueue('A')
p.enqueue('B')
p.enqueue('C')
p.enqueue('D')
p.enqueue('E')
assert p.dequeue() == 'A'
assert p.dequeue() == 'B'
assert p.dequeue() == 'C'
assert p.dequeue() == 'D'
assert p.dequeue() == 'E'
assert p.dequeue() is None
def test_dequeue():
pseudo_queue = PseudoQueue()
pseudo_queue.enqueue("one")
pseudo_queue.enqueue("two")
pseudo_queue.enqueue("three")
pseudo_queue.dequeue()
expected = "two\nthree"
actual = f"{pseudo_queue}"
assert expected == actual
def test_dequeue_when_full():
q = PseudoQueue()
q.enqueue("apples")
q.enqueue("bananas")
actual = q.dequeue()
expected = "apples"
assert actual == expected
def test_dequeue():
q = PseudoQueue()
q.enqueue("apple")
q.enqueue("banana")
actual = q.dequeue()
expected = "apple"
assert actual == expected
def test_can_successfully_dequeue():
new_queue = PseudoQueue()
new_queue.enqueue(5)
expected = 5
actual = new_queue.dequeue()
assert expected == actual
def test_dequeue():
pq = PseudoQueue()
pq.enqueue(5)
pq.enqueue(3)
pq.enqueue(1)
actual = pq.dequeue()
expected = 5
assert actual == expected
def test_dequeue_from_empty():
pseudo_queue = PseudoQueue()
expected = "empty stack"
actual = pseudo_queue.dequeue()
assert expected == actual
def test_dequeue(): pq = PseudoQueue() pq.enqueue(20) pq.enqueue(5) pq.enqueue(10) pq.enqueue(15) actual = pq.dequeue() expected = 20 assert actual == expected
def test_dequeue_when_empty():
q = PseudoQueue()
with pytest.raises(InvalidOperationError):
q.dequeue()
def test_can_successfully_throw_a_dequeue_exception():
new_queue = PseudoQueue()
expected = "Exception"
actual = new_queue.dequeue()
assert expected == actual
def test_enqueue_and_dequeue_one():
p = PseudoQueue()
p.enqueue('A')
assert p.dequeue() == 'A'