@percy/playwright

Percy visual testing for Playwright.

Installation

$ npm install --save-dev @percy/cli @percy/playwright

Usage

This is an example using the percySnapshot function. For other examples of playwright usage, see the Playwright docs.

const { chromium } = require('playwright');
const percySnapshot = require('@percy/playwright');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('http://example.com/', { waitUntil: 'networkidle2' });
  await percySnapshot(page, 'Example Site');

  await browser.close();
})();

Running the code above directly will result in the following logs:

$ node script.js
[percy] Percy is not running, disabling snapshots

When running with percy exec, and your project's PERCY_TOKEN, a new Percy build will be created and snapshots will be uploaded to your project.

$ export PERCY_TOKEN=[your-project-token]
$ percy exec -- node script.js
[percy] Percy has started!
[percy] Created build #1: https://percy.io/[your-project]
[percy] Running "node script.js"
[percy] Snapshot taken "Example Site"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Configuration

percySnapshot(page, name[, options])

• page (required) - A playwright page instance
• name (required) - The snapshot name; must be unique to each snapshot
• options - See per-snapshot configuration options

Percy on Automate

Usage

const { chromium } = require('playwright');
const percyScreenshot = require('@percy/playwright');

const desired_cap = {
  'browser': 'chrome',
  'browser_version': 'latest',
  'os': 'osx',
  'os_version': 'ventura',
  'name': 'Percy Playwright PoA Demo',
  'build': 'percy-playwright-javascript-tutorial',
  'browserstack.username': 'username',
  'browserstack.accessKey': 'accesskey'
};

(async () => {
  const cdpUrl = `wss://cdp.browserstack.com/playwright?caps=${encodeURIComponent(JSON.stringify(desired_cap))}`;
  const browser = await chromium.connect(cdpUrl);
  const page = await browser.newPage();
  await page.goto("https://percy.io/");
  await percyScreenshot(page, 'Screenshot 1');

  // Options for percyScreenshot
  // await percyScreenshot(page, 'Screenshot 1', {
  //   fullPage: true,
  //   percyCSS: 'body { background: red; }',
  //   ignoreRegionSelectors: ['#ignore-this'],
  //   customIgnoreRegions: [{ top: 10, right: 10, bottom: 120, left: 10 }],
  // });

  await browser.close();
})();

Configuration

percyScreenshot(page, name[, options])

• page (required) - A playwright page instance
• name (required) - The snapshot name; must be unique to each snapshot
• options (optional) - There are various options supported by percyScreenshot to server further functionality.
  • sync - Boolean value by default it falls back to false, Gives the processed result around screenshot [From CLI v1.28.8+]
  • fullPage - Boolean value by default it falls back to false, Takes full page screenshot [From CLI v1.27.6+]
  • freezeAnimatedImage - Boolean value by default it falls back to false, you can pass true and percy will freeze image based animations.
  • freezeImageBySelectors - List of selectors. Images will be freezed which are passed using selectors. For this to work freezeAnimatedImage must be set to true.
  • freezeImageByXpaths - List of xpaths. Images will be freezed which are passed using xpaths. For this to work freezeAnimatedImage must be set to true.
  • percyCSS - Custom CSS to be added to DOM before the screenshot being taken. Note: This gets removed once the screenshot is taken.
  • ignoreRegionXpaths - List of xpaths. elements in the DOM can be ignored using xpath
  • ignoreRegionSelectors - List of selectors. elements in the DOM can be ignored using selectors.
  • customIgnoreRegions - List of custom objects. elements can be ignored using custom boundaries. Just passing a simple object for it like below.
    • example: {top: 10, right: 10, bottom: 120, left: 10}
    • In above example it will draw rectangle of ignore region as per given coordinates.
      • top (int): Top coordinate of the ignore region.
      • bottom (int): Bottom coordinate of the ignore region.
      • left (int): Left coordinate of the ignore region.
      • right (int): Right coordinate of the ignore region.
  • considerRegionXpaths - List of xpaths. elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using xpaths.
  • considerRegionSelectors - List of selectors. elements in the DOM can be considered for diffing and will be ignored by Intelli Ignore using selectors.
  • customConsiderRegions - List of custom objects. elements can be considered for diffing and will be ignored by Intelli Ignore using custom boundaries
    • example: {top: 10, right: 10, bottom: 120, left: 10}
    • In above example it will draw rectangle of consider region will be drawn.
    • Parameters:
      • top (int): Top coordinate of the consider region.
      • bottom (int): Bottom coordinate of the consider region.
      • left (int): Left coordinate of the consider region.
      • right (int): Right coordinate of the consider region.
  • regions parameter that allows users to apply snapshot options to specific areas of the page. This parameter is an array where each object defines a custom region with configurations.
    • Parameters:

      • elementSelector (optional, only one of the following must be provided, if this is not provided then full page will be considered as region)

        • boundingBox (object): Defines the coordinates and size of the region.
          • x (number): X-coordinate of the region.
          • y (number): Y-coordinate of the region.
          • width (number): Width of the region.
          • height (number): Height of the region.
        • elementXpath (string): The XPath selector for the element.
        • elementCSS (string): The CSS selector for the element.

      • algorithm (mandatory)

        • Specifies the snapshot comparison algorithm.
        • Allowed values: standard, layout, ignore, intelliignore.

      • configuration (required for standard and intelliignore algorithms, ignored otherwise)

        • diffSensitivity (number): Sensitivity level for detecting differences.
        • imageIgnoreThreshold (number): Threshold for ignoring minor image differences.
        • carouselsEnabled (boolean): Whether to enable carousel detection.
        • bannersEnabled (boolean): Whether to enable banner detection.
        • adsEnabled (boolean): Whether to enable ad detection.

      • assertion (optional)

        • Defines assertions to apply to the region.
        • diffIgnoreThreshold (number): The threshold for ignoring minor differences.

Example Usage for regions

const obj1 = {
  elementSelector: {
    elementCSS: ".ad-banner" 
  },
  algorithm: "intelliignore", 
  configuration: {
    diffSensitivity: 2,
    imageIgnoreThreshold: 0.2,
    carouselsEnabled: true,
    bannersEnabled: true,
    adsEnabled: true
  },
  assertion: {
    diffIgnoreThreshold: 0.4,
  }
};

// we can use the createRegion function

const { createRegion } = percySnapshot;

const obj2 = createRegion({
  algorithm: "intelliignore",
  diffSensitivity: 3,
  adsEnabled: true,
  diffIgnoreThreshold: 0.4
});

percySnapshot(page, "Homepage 1", { regions: [obj1] });

Creating Percy on automate build

Note: Automate Percy Token starts with auto keyword. The command can be triggered using exec keyword.

$ export PERCY_TOKEN=[your-project-token]
$ percy exec -- [playwright test command]
[percy] Percy has started!
[percy] [Playwright example] : Starting automate screenshot ...
[percy] Screenshot taken "Playwright example"
[percy] Stopping percy...
[percy] Finalized build #1: https://percy.io/[your-project]
[percy] Done!

Refer to docs here: Percy on Automate