TestServiceClient.prototype.pingEmpty = function pingEmpty(requestMessage, metadata, callback) {
  if (arguments.length === 2) {
    callback = arguments[1];
  }
  grpc.unary(TestService.PingEmpty, {
    request: requestMessage,
    host: this.serviceHost,
    metadata: metadata,
    transport: this.options.transport,
    debug: this.options.debug,
    onEnd: function (response) {
      if (callback) {
        if (response.status !== grpc.Code.OK) {
          callback(Object.assign(new Error(response.statusMessage), { code: response.status, metadata: response.trailers }), null);
        } else {
          callback(null, response.message);
        }
      }
    }
  });
};