Method test_errors

Lib/test/test_subclassinit.py:214–247

(self)

        self.assertCountEqual(notified, ['a', 'b', 'c', 'd', 'e'])

    def test_errors(self):
        class MyMeta(type):
            pass

        with self.assertRaises(TypeError):
            class MyClass(metaclass=MyMeta, otherarg=1):
                pass

        with self.assertRaises(TypeError):
            types.new_class("MyClass", (object,),
                            dict(metaclass=MyMeta, otherarg=1))
        types.prepare_class("MyClass", (object,),
                            dict(metaclass=MyMeta, otherarg=1))

        class MyMeta(type):
            def __init__(self, name, bases, namespace, otherarg):
                super().__init__(name, bases, namespace)

        with self.assertRaises(TypeError):
            class MyClass2(metaclass=MyMeta, otherarg=1):
                pass

        class MyMeta(type):
            def __new__(cls, name, bases, namespace, otherarg):
                return super().__new__(cls, name, bases, namespace)

            def __init__(self, name, bases, namespace, otherarg):
                super().__init__(name, bases, namespace)
                self.otherarg = otherarg

        class MyClass3(metaclass=MyMeta, otherarg=1):
            pass

        self.assertEqual(MyClass3.otherarg, 1)

    def test_errors_changed_pep487(self):
        # These tests failed before Python 3.6, PEP 487