await on_data - вот как сервер-пустышка может взаимодействовать с тестовым сценарием

[arhadthedev]

async def client(addr):
            await asyncio.sleep(0.5)

            on_data = self.loop.create_future()
            on_eof = self.loop.create_future()

            tr, proto = await self.loop.create_connection(
                lambda: ClientProto(on_data, on_eof), *addr)

            tr.write(HELLO_MSG)

            new_tr = await self.loop.start_tls(tr, proto, client_context)
            print(f'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% {proto!r}')   - оригинад
            print(f'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% {new_tr!r}')  - какой нужен
            self.assertEqual(await on_data, b'O')
            new_tr.write(HELLO_MSG)
            await on_eof

            restored_tr = await self.loop.shutdown_tls(new_tr, proto)
            self.assertEqual(await on_data, b'H')
            restored_tr.write(HELLO_MSG)
            await on_eof

            new_tr.close()
            restored_tr.close()