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_dequeue_empty_after_multiple_dequeue():
q = PseudoQueue()
q.enqueue('monkey')
q.enqueue('business')
q.dequeue()
q.dequeue()
with pytest.raises(InvalidOperationError) as e:
q.dequeue()
assert str(e.value) == 'Method not allowed on an empty collection'
def test_pseudoqueue_dequeue_several():
q = PseudoQueue()
q.enqueue("orange")
q.enqueue("apple")
q.enqueue("lime")
q.dequeue()
q.dequeue()
actual = q.dequeue()
expected = "orange"
assert actual == expected
def test_dequeue_two():
q = PseudoQueue()
q.enqueue('monkey')
q.enqueue('business')
q.enqueue('time')
q.dequeue()
actual1 = q.dequeue()
expected1 = 'business'
assert actual1 == expected1
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_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_pseudoqueue_dequeue_one():
q = PseudoQueue()
q.enqueue("orange")
actual = q.dequeue()
expected = "orange"
assert actual == expected
def test_dequeue_when_empty():
q = PseudoQueue()
with pytest.raises(InvalidOperationError):
q.dequeue()
