def test_rejects_invalid_args():
try:
bottom_up(Dir('A'), None)
assert False, 'Invalid tool.'
except:
pass
try:
bottom_up(None, lambda x: x)
assert False, 'Invalid tool.'
except:
pass
def test_bottom_up():
d1 = Dir('A')
d2 = Dir('B')
d3 = Dir('C')
d4 = Dir('D')
d3.parent = d2
d4.parent = d2
d2.parent = d1
order = []
def tool(item):
order.append(item.name)
bottom_up(d1, tool)
assert order == ['C', 'D', 'B', 'A'], str(order)