How to patch a class with python asynctest?

Question

Python

Help, please, deal with the patch in asynctest
I don’t understand how to change the class. Individual methods are replaced correctly, but the entire class cannot be replaced.
I don’t want to fence a mountain of decorators over each test method.
A working example with replacing methods with an empty function:

class TestGamePrepare(TestCase):
    chat_id = -12345667890
    admin_id = 987654321

    async def setUp(self):
        self.game = await get_game(self.chat_id)

    @patch('game.Game.delete_messages', pass_func)
    async def tearDown(self):
        await self.game.cancel()

    @patch('game.Game.say', pass_func)
    @patch('game.Game.unmute', pass_func)
    @patch('game.Game.read_game_settings', pass_func)
    @patch('game.Game.delete_messages', pass_func)
    async def test_game_prepare(self):
        """ Good prepare case """
        await self.game.prepare_game(self.admin_id)
        self.assertEqual(self.game.mode, GameModes.REGISTRATION)

I tried to make a class-child of NewGame with overridden pass-methods, and then show @patch('game.Game', NewGame) as a decorator - it doesn't work.