load_test.js

/* 
To run load test:
1. Install k6 (https://k6.io/docs/get-started/installation/)
2. Run command: `k6 run load_test.js` from main directory

Notes:
Apart from using stages (current test), load tests were tried with 100-1000 users with 10s duration 
to test both the duration of requests with varying loads as well as the point at which we start to receive 
non 200 status codes. After 200 simultaneous users, the request duration reaches 10-12 seconds but we see no
failures until 600 conssequent users at which point the request duration jumps to 20 seconds and we see our first
failure. However, even at this number, 99% of all requests return a 200 status code.
*/

import http from 'k6/http'
import { check, sleep } from 'k6'

export const options = {
  stages: [
    { duration: '30s', target: 25 },
    { duration: '1m', target: 100 },
    { duration: '20s', target: 20 },
  ],
  thresholds: {
    http_req_failed: ['rate<0.01'], // http errors should be less than 1%
    http_req_duration: ['p(95)<300'], // 95% of requests should be below 300ms
  },
}

export default function () {
  const pages = ['/', '/questions', '/results', '/resultats']

  const headers = {
    'upgrade-insecure-requests': '1',
    'sec-ch-ua':
      '" Not A;Brand";v="99", "Chromium";v="96", "Google Chrome";v="96"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Linux"',
  }

  for (const page of pages) {
    const res = http.get(
      'https://ep-be-staging.bdm-dev-rhp.dts-stn.com' + page,
      { headers }
    )

    check(res, {
      'status was 200': (r) => r.status == 200,
      'duration was <=': (r) => r.timings.duration <= 300,
    })
    sleep(1)
  }
}