async def METHOD_NAME(case, grpc_client, gate):
    try:
        await asyncio.wait_for(
            _REQUESTS[case](grpc_client, gate), timeout=10.0,
        )
        assert False, 'Server must return UNAVAILABLE'
    except asyncio.TimeoutError:
        assert False, 'Client channel not ready by timeout'
    except grpc.RpcError as error:
        assert grpc.StatusCode.UNAVAILABLE == error.code()