Method test_async_contextmanager

Lib/test/test_typing.py:7922–7937

(self)

        self.assertEqual(get_args(gen_cm.__value__[int, None]), (int, types.NoneType))

    def test_async_contextmanager(self):
        class NotACM:
            pass
        self.assertIsInstance(ACM(), typing.AsyncContextManager)
        self.assertNotIsInstance(NotACM(), typing.AsyncContextManager)
        @contextlib.contextmanager
        def manager():
            yield 42

        cm = manager()
        self.assertNotIsInstance(cm, typing.AsyncContextManager)
        self.assertEqual(typing.AsyncContextManager[int].__args__, (int, bool | None))
        with self.assertRaises(TypeError):
            isinstance(42, typing.AsyncContextManager[int])
        with self.assertRaises(TypeError):
            typing.AsyncContextManager[int, str, float]

    def test_asynccontextmanager_type_params(self):
        cm1 = typing.AsyncContextManager[int]