@visual-regression-tracker/agent-playwright

Native integration for Playwright with Visual Regression Tracker

Npm

https://www.npmjs.com/package/@visual-regression-tracker/agent-playwright

Install

npm install @visual-regression-tracker/agent-playwright

Usage

Import

import {
  PlaywrightVisualRegressionTracker,
  Config,
} from "@visual-regression-tracker/agent-playwright";
import { chromium, Browser, Page, BrowserContext } from "playwright";

Configure connection

Explicit config from code

const browserType = chromium; // any BrowserType supported by Playwright

const config: Config = {
  // URL where backend is running
  // Required
  apiUrl: "http://localhost:4200",

  // Project name or ID
  // Required
  project: "Default project",

  // User apiKey
  // Required
  apiKey: "tXZVHX0EA4YQM1MGDD",

  // Current git branch
  // Required
  branchName: "develop",

  // Log errors instead of throwing exceptions
  // Optional - default false
  enableSoftAssert: true,

  // Unique ID related to one CI build
  // Optional - default null
  ciBuildId: "SOME_UNIQUE_ID",
};

const vrt = new PlaywrightVisualRegressionTracker(browserType, config);

Or, as JSON config file vrt.json

Used only if not explicit config provided Is overriden if ENV variables are present

{
  "apiUrl": "http://localhost:4200",
  "project": "Default project",
  "apiKey": "tXZVHX0EA4YQM1MGDD",
  "ciBuildId": "commit_sha",
  "branchName": "develop",
  "enableSoftAssert": false
}

Or, as environment variables

Used only if not explicit config provided

VRT_APIURL="http://localhost:4200"
VRT_PROJECT="Default project"
VRT_APIKEY="tXZVHX0EA4YQM1MGDD"
VRT_CIBUILDID="commit_sha"
VRT_BRANCHNAME="develop"
VRT_ENABLESOFTASSERT=true

Setup

vrt.start();

Teardown

vrt.stop();

Navigate to needed page

// set up Playwright
const browser = await browserType.launch({ headless: false });
const context = await browser.newContext();
const page = await context.newPage();

// navigate to url
await page.goto("https://google.com/");

Track page

await vrt.trackPage(page, imageName[, options])

• page <Page> Playwright page
• imageName <string> name for the taken screenshot image
• options <Object> optional configuration with:
• • diffTollerancePercent <number> specify acceptable difference from baseline, between 0-100.
• • ignoreAreas <Array<Object>>
• • • x <number> X-coordinate relative of left upper corner
• • • y <number> Y-coordinate relative of left upper corner
• • • width <number> area width in px
• • • height <number> area height in px
• • screenshotOptions <Object> configuration for Playwrights screenshot method
• • • fullPage <boolean> When true, takes a screenshot of the full scrollable page, instead of the currently visibvle viewport. Defaults to false.
• • • omitBackground <boolean> Hides default white background and allows capturing screenshots with transparency. Defaults to false.
• • • clip <Object> An object which specifies clipping of the resulting image. Should have the following fields:
• • • • x <number> x-coordinate of top-left corner of clip area
• • • • y <number> y-coordinate of top-left corner of clip area
• • • • width <number> width of clipping area
• • • • height <number> height of clipping area
• • • timeout <number> Maximum time in milliseconds, defaults to 30 seconds, pass 0 to disable timeout.
• • agent <Object> Additional information to mark baseline across agents that have different:
• • • os <string> operating system name, like Windows, Mac, etc.
• • • device <string> device name, PC identifier, mobile identifier etc.
• • • viewport <string> viewport size.

Track elementHandle

await vrt.trackElementHandle(elementHandle, imageName[, options])

• elementHandle <ElementHandle> Playwright ElementHandle
• imageName <string> name for the taken screenshot image
• options <Object> optional configuration with:
• • diffTollerancePercent <number> specify acceptable difference from baseline, between 0-100.
• • ignoreAreas <Array<Object>>
• • • x <number> X-coordinate relative of left upper corner
• • • y <number> Y-coordinate relative of left upper corner
• • • width <number> area width in px
• • • height <number> area height in px
• • screenshotOptions <Object> configuration for Playwrights screenshot method
• • • omitBackground <boolean> Hides default white background and allows capturing screenshots with transparency. Defaults to false.
• • • timeout <number> Maximum time in milliseconds, defaults to 30 seconds, pass 0 to disable timeout.
• • agent <Object> Additional information to mark baseline across agents that have different:
• • • os <string> operating system name, like Windows, Mac, etc.
• • • device <string> device name, PC identifier, mobile identifier etc.
• • • viewport <string> viewport size.