playwright-har is capturing HAR files from browser network traffic and saves them to simplify debugging of failed tests.
This is a port of puppeteer-har that was adjusted to work with Playwright.
npm i --save playwright-har
import { chromium } from 'playwright'
import { PlaywrightHar } from 'playwright-har'
(async () => {
const browser = await chromium.launch();
const context = await browser.newContext();
const page = await context.newPage();
const playwrightHar = new PlaywrightHar(page);
await playwrightHar.start();
await page.goto('http://whatsmyuseragent.org/');
// ... other actions ...
await playwrightHar.stop('./example.har');
await browser.close();
})();
Integration with jest-playwright preset
In CustomEnvironment.js :
const PlaywrightEnvironment = require('jest-playwright-preset/lib/PlaywrightEnvironment').default
const { PlaywrightHar } = require('playwright-har');
class CustomEnvironment extends PlaywrightEnvironment {
constructor(config, context) {
super(config, context);
this.playwrightHar;
}
async handleTestEvent(event) {
if (event.name == 'test_start') {
if (this.global.browserName === 'chromium') {
this.playwrightHar = new PlaywrightHar(this.global.page);
await this.playwrightHar.start();
}
}
if (event.name == 'test_done') {
if (this.global.browserName === 'chromium') {
const parentName = event.test.parent.name.replace(/\W/g, '-');
const specName = event.test.name.replace(/\W/g, '-');
await this.playwrightHar.stop(`./${parentName}_${specName}.har`);
}
}
}
}
module.exports = CustomEnvironment;
This setup will create PlaywrightHar
instance for each test
statement in describe
statement in spec file. Browser network traffic will be collected from this step execution and save it in .har
file with name corresponding to describe
name followed by test
name.
- HAR files collection works only on chromium browser
stop()
has an optional argumentpath
- when specified, generated HAR file will be saved into provided path, otherwise it will be returned as an object