brew install k6

docker pull grafana/k6

k6 new

import http from 'k6/http';
import { sleep } from 'k6';

export const options = {
  // A number specifying the number of VUs to run concurrently.
  vus: 10,
  // A string specifying the total duration of the test run.
  duration: '30s',

  // The following section contains configuration options for execution of this
  // test script in Grafana Cloud.
  //
  // See https://grafana.com/docs/grafana-cloud/k6/get-started/run-cloud-tests-from-the-cli/
  // to learn about authoring and running k6 test scripts in Grafana k6 Cloud.
  //
  // ext: {
  //   loadimpact: {
  //     // The ID of the project to which the test is assigned in the k6 Cloud UI.
  //     // By default tests are executed in default project.
  //     projectID: "",
  //     // The name of the test in the k6 Cloud UI.
  //     // Test runs with the same name will be grouped.
  //     name: "hoge.js"
  //   }
  // },

  // Uncomment this section to enable the use of Browser API in your tests.
  //
  // See https://grafana.com/docs/k6/latest/using-k6-browser/running-browser-tests/ to learn more
  // about using Browser API in your test scripts.
  //
  // scenarios: {
  //   // The scenario name appears in the result summary, tags, and so on.
  //   // You can give the scenario any name, as long as each name in the script is unique.
  //   ui: {
  //     // Executor is a mandatory parameter for browser-based tests.
  //     // Shared iterations in this case tells k6 to reuse VUs to execute iterations.
  //     //
  //     // See https://grafana.com/docs/k6/latest/using-k6/scenarios/executors/ for other executor types.
  //     executor: 'shared-iterations',
  //     options: {
  //       browser: {
  //         // This is a mandatory parameter that instructs k6 to launch and
  //         // connect to a chromium-based browser, and use it to run UI-based
  //         // tests.
  //         type: 'chromium',
  //       },
  //     },
  //   },
  // }
};

// The function that defines VU logic.
//
// See https://grafana.com/docs/k6/latest/examples/get-started-with-k6/ to learn more
// about authoring k6 scripts.
//
export default function() {
  http.get('https://test.k6.io');
  sleep(1);
}

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

export let options = {
  vus: 10,  // 仮想ユーザー数
  duration: '30s',  // 実行時間
};

export default function () {
  let response = http.get('https://example.com');
  check(response, { 'status is 200': (r) => r.status === 200 });
  sleep(1);
}

k6 run test-script.js 

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: test.js
     output: -

  scenarios: (100.00%) 1 scenario, 10 max VUs, 1m0s max duration (incl. graceful stop):
           * default: 10 looping VUs for 30s (gracefulStop: 30s)
	   
     data_received..................: 3.0 MB 96 kB/s
     data_sent......................: 28 kB  911 B/s
     http_req_blocked...............: avg=17.47ms  min=2µs      med=5µs      max=457.81ms p(90)=8µs      p(95)=24.69µs 
     http_req_connecting............: avg=6.87ms   min=0s       med=0s       max=182.71ms p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=182.93ms min=174.29ms med=176.02ms max=349.4ms  p(90)=177.33ms p(95)=178.13ms
       { expected_response:true }...: avg=182.93ms min=174.29ms med=176.02ms max=349.4ms  p(90)=177.33ms p(95)=178.13ms
     http_req_failed................: 0.00%  ✓ 0        ✗ 254 
     http_req_receiving.............: avg=6.91ms   min=32µs     med=70.5µs   max=173.03ms p(90)=355µs    p(95)=628.79µs
     http_req_sending...............: avg=26.9µs   min=9µs      med=20µs     max=684µs    p(90)=35µs     p(95)=40µs    
     http_req_tls_handshaking.......: avg=8.05ms   min=0s       med=0s       max=216.55ms p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=175.99ms min=173.46ms med=175.82ms max=196.98ms p(90)=176.9ms  p(95)=177.23ms
     http_reqs......................: 254    8.180674/s
     iteration_duration.............: avg=1.2s     min=1.17s    med=1.17s    max=1.63s    p(90)=1.17s    p(95)=1.34s   
     iterations.....................: 254    8.180674/s
     vus............................: 4      min=4      max=10
     vus_max........................: 10     min=10     max=10


running (0m31.0s), 00/10 VUs, 254 complete and 0 interrupted iterations
default ✓ [======================================] 10 VUs  30s

export let options = {
  thresholds: {
    'http_req_duration{p(95)}': ['<500'],  // 95%のリクエストが500ms以内
  },
};

// 1. init: 関数外のスコープは全てinitになる

export function setup() {
  // 2. setup: テスト実行(`k6 run`)1回につき１度テスト実行前に呼び出される
}

export default function() {
  // 3. VU code: 実際のテストシナリオ
}

export function teardown() {
  // 4. teardown code: テスト実行(`k6 run`)1回につき１度テスト実行後に呼び出される
}