Class TestInstanceList

tests/test_traitlets.py:1701–1718

class TestInstanceList(TraitTestBase):
    obj = InstanceListTrait()

    def test_klass(self):
        """Test that the instance klass is properly assigned."""
        self.assertIs(self.obj.traits()["value"]._trait.klass, Foo)

    _default_value: t.List[t.Any] = []
    _good_values = [[Foo(), Foo()], []]
    _bad_values = [
        [
            "1",
            2,
        ],
        "1",
        [Foo],
        None,
    ]


class UnionListTrait(HasTraits):