def test_unwrap():
o = Ok('yay')
n = Err('nay')
assert o.unwrap() == 'yay'
with pytest.raises(UnwrapError):
n.unwrap()
def test_error_context():
n = Err('nay')
with pytest.raises(UnwrapError) as e:
n.unwrap()
assert e.value.result is n
