Function test_allow_none_default_value

tests/test_traitlets.py:1817–1827

(Trait)

    ),
)
def test_allow_none_default_value(Trait):
    class C(HasTraits):
        t = Trait(default_value=None, allow_none=True)

    # test default value
    c = C()
    assert c.t is None

    # and in constructor
    c = C(t=None)
    assert c.t is None


@pytest.mark.parametrize(