Method test_no_instantiation

Lib/test/test_typing.py:2983–3010

(self)

        self.assertEqual(typing.get_protocol_members(NewGeneric), {'z'})

    def test_no_instantiation(self):
        class P(Protocol): pass

        with self.assertRaises(TypeError):
            P()

        class C(P): pass

        self.assertIsInstance(C(), C)
        with self.assertRaises(TypeError):
            C(42)

        T = TypeVar('T')

        class PG(Protocol[T]): pass

        with self.assertRaises(TypeError):
            PG()
        with self.assertRaises(TypeError):
            PG[int]()
        with self.assertRaises(TypeError):
            PG[T]()

        class CG(PG[T]): pass

        self.assertIsInstance(CG[int](), CG)
        with self.assertRaises(TypeError):
            CG[int](42)

    def test_protocol_defining_init_does_not_get_overridden(self):
        # check that P.__init__ doesn't get clobbered