test3.js

import { randomString, randomIntBetween } from 'https://jslib.k6.io/k6-utils/1.2.0/index.js';
import ws from 'k6/ws';
import { check, sleep } from 'k6';

const sessionDuration = randomIntBetween(10000, 60000); // user session between 10s and 1m
const chatRoomName = 'publicRoom'; // choose your chat room name

export const options = {
  vus: 10,
  iterations: 10,
};

export default function () {
  const url = `ws://localhost:8080/chat`;
  const params = { tags: { my_tag: 'my ws session' } };

  const res = ws.connect(url, params, function (socket) {
    socket.on('open', function open() {
      console.log(`VU ${__VU}: connected`);

      const sender = 'user_' + __VU;
      const content = `I'm saying ${randomString(5)}`;
      const messageId = `${__VU}-${Date.now()}`;
      const sentTime = Date.now();

      const message = JSON.stringify({
        sender: sender,
        content: content,
        messageId: messageId,
        sentTime: sentTime,
      }); 

      socket.send(message);

      socket.setInterval(function timeout() {


        socket.send(message);
      }, randomIntBetween(2000, 8000)); // say something every 2-8seconds
    });

    socket.on('ping', function () {
      console.log('PING!');
    });

    socket.on('pong', function () {
      console.log('PONG!');
    });

    socket.on('close', function () {
      console.log(`VU ${__VU}: disconnected`);
    });

    socket.on('message', function (message) {
      const msg = JSON.parse(message);
      console.log(`VU ${__VU} received: ${msg.sender} says: ${msg.content}`);
      // if (msg.content === 'CHAT_MSG') {
      //   console.log(`VU ${__VU} received: ${msg.user} says: ${msg.message}`);
      // } else if (msg.content === 'ERROR') {
      //   console.error(`VU ${__VU} received:: ${msg.message}`);
      // } else {
      //   console.log(`VU ${__VU} received unhandled message: ${msg.message}`);
      // }
    });

    socket.setTimeout(function () {
      console.log(`VU ${__VU}: ${sessionDuration}ms passed, leaving the chat`);
      socket.send(JSON.stringify({ event: 'LEAVE' }));
    }, sessionDuration);

    socket.setTimeout(function () {
      console.log(`Closing the socket forcefully 3s after graceful LEAVE`);
      socket.close();
    }, sessionDuration + 3000);
  });

  check(res, { 'Connected successfully': (r) => r && r.status === 101 });
}