Class MyIntTT

tests/test_traitlets.py:132–136

    def test_default_validate(self):
        class MyIntTT(TraitType[int, int]):
            def validate(self, obj, value):
                if isinstance(value, int):
                    return value
                self.error(obj, value)

        class A(HasTraits):
            tt = MyIntTT(10)