def test_no_arg_ok():
top_level = Ok()
assert top_level.is_ok() is True
assert top_level.ok() is True
class_method = Result.Ok()
assert class_method.is_ok() is True
assert class_method.ok() is True
def test_no_arg_ok():
top_level = Ok()
assert top_level.is_ok() is True
assert top_level.ok() is True
def test_ok_method():
o = Ok('yay')
n = Err('nay')
assert o.ok() == 'yay'
assert n.ok() is None
