Method checkSubclasses

python/python3/tornado/test/util_test.py:100–109

(self)

        TestConfig3._restore_configuration(self.saved3)

    def checkSubclasses(self):
        # no matter how the class is configured, it should always be
        # possible to instantiate the subclasses directly
        self.assertIsInstance(TestConfig1(), TestConfig1)
        self.assertIsInstance(TestConfig2(), TestConfig2)

        obj = TestConfig1(a=1)
        self.assertEqual(obj.a, 1)
        obj2 = TestConfig2(b=2)
        self.assertEqual(obj2.b, 2)

    def test_default(self):
        # In these tests we combine a typing.cast to satisfy mypy with