message: [test]: fix test in rpc client
diff: @@ -20,9 +20,9 @@ fn test_multi_client() -> Result<()> {
  let mut system = System::new("test");
  let config = Arc::new(NodeConfig::random_for_test());
  - let http_address = config.rpc.http_address.as_ref().unwrap();
  + let ws_address = config.rpc.ws_address.as_ref().unwrap();
  let ipc_file = config.rpc.get_ipc_file().to_path_buf();
  - let url = format!("http://{}", http_address.to_string());
  + let url = format!("ws://{}", ws_address.to_string());
  debug!("url:{}", url);
  debug!("data_dir:{:?}", config.data_dir());
  @@ -39,8 +39,8 @@ fn test_multi_client() -> Result<()> {
  info!("client thread start.");
  std::thread::sleep(Duration::from_millis(300));
  - let http_client = RpcClient::connect_http(url.as_str()).unwrap();
  - let status = http_client.node_status().unwrap();
  + let ws_client = RpcClient::connect_websocket(url.as_str()).unwrap();
  + let status = ws_client.node_status().unwrap();
  info!("http_client status: {}", status);
  assert!(status);
  