Method test_notify_one

tests/test_traitlets.py:462–473

(self)

        self.assertEqual(len(self._notify1), 0)

    def test_notify_one(self):
        class A(HasTraits):
            a = Int()
            b = Float()

        a = A()
        a.on_trait_change(self.notify1, "a")
        a.a = 0
        self.assertEqual(len(self._notify1), 0)
        a.a = 10
        self.assertTrue(("a", 0, 10) in self._notify1)
        self.assertRaises(TraitError, setattr, a, "a", "bad string")

    def test_subclass(self):
        class A(HasTraits):