Testing ws memory leak k6

script.js

'use strict'

var ws = require("k6/ws")
var  k6 = require("k6")
var check = k6.check
var sleep = k6.sleep
var Counter  = require('k6/metrics').Counter

var FetchRecordsSuccessRate = new Counter('FetchRecords_SuccessRate');
var connections = new Counter('Client_Read_Connections');
var RecordNumber = new Counter("RecordNumber");
var ErrorCounter = new Counter("ErrorCounter");

module.exports.FetchRecordsSuccessRate = FetchRecordsSuccessRate
module.exports.connections = connections
module.exports.RecordNumber = RecordNumber
module.exports.ErrorCounter = ErrorCounter

module.exports.default = function() {
    var url = "ws://127.0.0.1:8080/numbers"

    var res = ws.connect(url, {}, function(socket) {
    var t = Math.floor(Math.random() * 5000)
    socket.setTimeout(function() {
      // console.log( t, "milliseconds passed, closing the socket");
      socket.close();
    }, t);


    socket.on("message", function(data) {
      try {        
        if (data && data.length) {
          // console.log(data)
          var num = parseInt(data, 10)
          
          RecordNumber.add(Number(num))
        }
      } catch (e) {
         console.log(e)
        ErrorCounter.add(true)
      }

        FetchRecordsSuccessRate.add(!!data)
    });
  });

  sleep(1)
}

server.go

// Copyright 2015 The Gorilla WebSocket Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"flag"
	"log"
	"net/http"

	"github.com/gorilla/websocket"
)

var addr = flag.String("addr", "localhost:8080", "http service address")

var upgrader = websocket.Upgrader{} // use default options

func numbers(w http.ResponseWriter, r *http.Request) {
	c, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Print("upgrade:", err)

		return
	}
	defer c.Close()
	for {
		err = c.WriteMessage(websocket.TextMessage, []byte("123"))
		if err != nil {
			log.Println("write:", err)

			return
		}
	}
}

func main() {
	flag.Parse()
	log.SetFlags(0)
	http.HandleFunc("/numbers", numbers)
	log.Fatal(http.ListenAndServe(*addr, nil))
}