def test_callback_list():
class Callbacks(object):
def __init__(self):
self.sizes = []
self.indices = []
def on_size_change(self, list_instance):
self.sizes.append(len(list_instance))
def on_item_change(self, list_instance, index):
self.indices.append(index)
callbacks = Callbacks()
# CHeck that things work properly without callbacks
l = CallbackList([1, 2, 3])
# Register callbacks
l.on_size_change = callbacks.on_size_change
l.on_item_change = callbacks.on_item_change
l.append(2)
l.append(6)
l.pop(3)
l.remove(1)
l.insert(0, 9)
l.extend([4, 5, 4])
l[2] = 9
del l[1]
assert l == [9, 9, 6, 4, 5, 4]
assert callbacks.sizes == [4, 5, 4, 3, 4, 7, 6]
assert callbacks.indices == [2]
def test_callback_list_nocallbacks():
# CHeck that things work properly without callbacks
l = CallbackList([1, 2, 3])
l.append(2)
l.append(6)
l.pop(3)
l.remove(1)
l.insert(0, 9)
l.extend([4, 5, 4])
l[2] = 9
del l[1]
assert l == [9, 9, 6, 4, 5, 4]