def test_get_front_empty():
"""
GIVEN empty queue
WHEN get_front is called
THEN queueEmptyError is raised.
"""
test_queue = queue.Queue()
with pytest.raises(queue.QueueEmptyError):
test_queue.get_front()
def test_is_empty_empty():
"""
GIVEN empty queue
WHEN is_empty is called
THEN True is returned.
"""
test_queue = queue.Queue()
result = test_queue.is_empty()
assert result is True
def test_is_empty_not_empty():
"""
GIVEN queue that is not empty
WHEN is_empty is called
THEN False is returned.
"""
test_queue = queue.Queue()
test_queue.enqueue("value 1")
result = test_queue.is_empty()
assert result is False
def test_clear():
"""
GIVEN queue with length 1 with an item
WHEN clear is called
THEN the queue is empty and can be filled up again.
"""
test_queue = queue.Queue(1)
test_queue.enqueue("value 1")
test_queue.clear()
assert test_queue.is_empty() is True
test_queue.enqueue("value 2")
def test_get_front_multiple():
"""
GIVEN queue with a multiple values
WHEN get_front is called
THEN the front value is returned.
"""
test_queue = queue.Queue()
test_queue.enqueue("value 1")
test_queue.enqueue("value 2")
returned_value = test_queue.get_front()
assert returned_value == "value 1"
def test_get_front_single():
"""
GIVEN queue with a single value
WHEN get_front is called
THEN the value is returned and can still be dequeued.
"""
test_queue = queue.Queue()
value = "value 1"
test_queue.enqueue(value)
returned_value = test_queue.get_front()
assert returned_value == value
assert test_queue.dequeue() == value
def test_enqueue_dequeue(length, actions):
"""
GIVEN list of enqueue (with value to enqueue) and dequeue (with value expected to
be dequeued) actions and the length of a queue
WHEN actions are performed
THE expected values are dequeued.
"""
test_queue = queue.Queue(length)
for action in actions:
operation, value = action
if operation == "enq":
test_queue.enqueue(value)
elif operation == "deq":
assert test_queue.dequeue() == value
def test_end_deq_raise(length, operations, exception):
"""
GIVEN length of queue, operations to perform and exception that should be raised
WHEN queue with the length is constructed and the operations are performed
THEN the exception is raised
"""
test_queue = queue.Queue(length)
def perform_operation(operation):
if operation == "enq":
test_queue.enqueue("value")
elif operation == "deq":
test_queue.dequeue()
else:
raise Exception
for idx, operation in enumerate(operations):
if idx == len(operations) - 1:
with pytest.raises(exception):
perform_operation(operation)
continue
perform_operation(operation)