def test_listsize(self):
a_list = [1,2,3,4]
ivc = CallbackCounter('test_counter', lambda: len(a_list))
# in this case the callback can also be a_list.__len__
self.assertEqual(ivc.get_current(), 4)
a_list.extend([5,6,7])
self.assertEqual(ivc.get_current(), 7)
a_list.remove(1)
self.assertEqual(ivc.get_current(), 6)
def test_disabling(self):
ivc = CallbackCounter('test_counter', lambda: 0)
ivc.disable()
self.assertRaises(NoData, ivc.get_current)
ivc.enable()
self.assertEqual(ivc.get_current(), 0)
