def test_showtree(self):
"""test Argument.__showtree__()"""
output = []
getter, marker = object(), object()
get = lambda code: output.append((getter, code))
mark = lambda: output.append(marker)
node1 = Argument(wraptext("foobar"))
node2 = Argument(wraptext("foo"), wraptext("bar"))
node1.__showtree__(output.append, get, mark)
node2.__showtree__(output.append, get, mark)
valid = [
"{{{", (getter, node1.name), "}}}", "{{{", (getter, node2.name),
" | ", marker, (getter, node2.default), "}}}"]
self.assertEqual(valid, output)