def test_split(self):
T = namedtuple('T', ['friends', 'children'])
x = T(['alice', 'bob'],
[T(['carrie'], [T(['dan'], [])]),
T(['ellen'], [])])
self.assertEqual(
list(iterutils.recursive_walk(x, 'friends', 'children')),
['alice', 'bob', 'carrie', 'dan', 'ellen'])
def test_unified(self):
T = namedtuple('T', ['children'])
x = T([T([T([])]), T([])])
self.assertEqual(list(iterutils.recursive_walk(x, 'children')),
[T([T([])]), T([]), T([])])