test_jstraitlets.py 文件源码

def test_hastraits_required():

    class Foo(jst.JSONHasTraits):
        _required_traits = ['name']
        name = jst.JSONString()
        age = jst.JSONNumber()

    f1 = Foo(name="Sue", age=32)
    f2 = Foo(age=32)

    # contains all required pieces
    f1.to_dict()

    with pytest.raises(T.TraitError) as err:
        f2.to_dict()
    assert err.match("Required trait 'name' is undefined")