def test_enqueue_two():
q = Queue()
q.enqueue("apples")
q.enqueue("bananas")
actual = q.peek()
expected = "apples"
assert actual == expected
def test_peek():
q = Queue()
q.enqueue("apple")
q.enqueue("banana")
q.enqueue("cucumber")
actual = q.peek()
expected = "apple"
assert actual == expected
def test_dequeue():
q = Queue()
q.enqueue("apple")
q.enqueue("banana")
q.dequeue()
actual = q.peek()
expected = "banana"
assert actual == expected
def test_peek_queue_long():
s = Queue()
s.enqueue("apple")
s.enqueue("cucumber")
s.enqueue("phone")
actual = s.peek()
expected = "apple"
assert actual == expected
def test_peek_when_empty():
q = Queue()
with pytest.raises(InvalidOperationError) as e:
q.peek()
assert str(e.value) == "Method not allowed on an empty collection"
def test_peek_queue():
s = Queue()
s.enqueue("apple")
actual = s.peek()
expected = "apple"
assert actual == expected
def test_peek_when_empty():
q = Queue()
with pytest.raises(InvalidOperationError):
q.peek()
def test_peek_on_empty_queue():
new_queue = Queue()
with pytest.raises(InvalidOperationError) as e:
new_queue.peek()
assert str(e.value) == "Method not allowed on empty collection"