def test_two_undos(self, door_and_invoker):
door, invoker = door_and_invoker
invoker.activate(door)
invoker.deactivate(door)
for i in range(2):
invoker.undo()
assert not door.locked
def test_lots_of_undos(self, ninjas_and_invoker):
ninjas, invoker = ninjas_and_invoker
for i in range(30):
invoker.activate(ninjas)
invoker.deactivate(ninjas)
for i in range(40):
invoker.undo()
assert not ninjas.armed
def test_undo_too_many_times(self, ninjas_and_invoker):
ninjas, invoker = ninjas_and_invoker
with pytest.raises(Exception):
invoker.undo()
def test_off_undo(self, toaster_and_invoker):
toaster, invoker = toaster_and_invoker
toaster.on()
invoker.deactivate(toaster)
invoker.undo()
assert toaster.is_on
def test_on_undo(self, toaster_and_invoker):
toaster, invoker = toaster_and_invoker
invoker.activate(toaster)
invoker.undo()
assert not toaster.is_on