def test_dequeue_dog():
tacoma = Animal_shelter()
tacoma.enqueue('dog', 'spike')
tacoma.enqueue('dog', 'Ruff')
tacoma.enqueue('cat', 'BLAH')
assert tacoma.dequeue('dog').name == 'spike'
def test_dequeue_cat():
auburn = Animal_shelter()
auburn.enqueue('dog', 'spike')
auburn.enqueue('dog', 'Ruff')
auburn.enqueue('cat', 'BLAH')
assert auburn.dequeue('cat').name == 'blah'
def test_dequeue_nonexistent_dog():
tukwila = Animal_shelter()
tukwila.enqueue('cat', 'Petunia')
tukwila.enqueue('cat', 'Polly')
assert tukwila.dequeue('dog') is None
def test_dequeue_nonexistent_cat():
convington = Animal_shelter()
convington.enqueue('dog', 'spike')
convington.enqueue('dog', 'Ruff')
assert convington.dequeue('cat') is None
def test_dequeue_bunny():
sumner = Animal_shelter()
sumner.enqueue('cat', 'Petunia')
sumner.enqueue('cat', 'Polly')
assert sumner.dequeue('bunny') is None