Visual Regression Testing with Percy

 🔍 Visual Regression Testing with Percy

📌 What is Visual Regression Testing?

Visual regression testing is the process of detecting unintended visual changes in a web application’s UI. Unlike functional tests that check how something works, visual regression tests check how something looks.


It answers:


“Did the UI change visually from the last version?”


🧰 What is Percy?

Percy is a cloud-based visual testing tool that helps developers and QA teams:


Automatically capture UI snapshots


Compare screenshots across code changes


Highlight visual differences (diffs)


Integrate easily with CI/CD tools and frameworks like Selenium, Cypress, Playwright, Storybook, etc.


Percy is part of BrowserStack.


🚀 How Percy Works

You run your tests (e.g., using Playwright, Cypress, or Selenium).


Percy takes screenshots of web pages or components.


It compares them to the baseline (previous screenshots).


If there’s a difference, Percy highlights it and allows you to:


Accept the change


Reject it


Investigate the issue


✅ Key Features of Percy

✨ Pixel-by-pixel comparison


🔁 Automatic baseline updates


🔒 Secure build logs and snapshots


🌐 Cross-browser testing support


🔄 CI/CD Integration (GitHub, GitLab, Bitbucket, CircleCI, Jenkins, etc.)


🛠️ Using Percy: Quick Example with Playwright

bash

Copy

Edit

# 1. Install Percy

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


# 2. Run your test and capture snapshots

npx percy exec -- node test.js

test.js:


js

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Edit

const { test, expect } = require('@playwright/test');

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


test('Homepage visual test', async ({ page }) => {

  await page.goto('https://yourwebsite.com');

  await percySnapshot(page, 'Homepage Snapshot');

});

🔗 Percy Integrations

Frameworks: Playwright, Cypress, Selenium, WebdriverIO


CI Tools: GitHub Actions, CircleCI, Travis, GitLab CI


Front-End Tools: Storybook, React, Angular


📊 Benefits of Using Percy

Catch visual bugs early


Improve UI stability across releases


Enhance collaboration between devs, testers, and designers


Reduce manual visual checking


📝 Conclusion

Visual bugs are harder to catch with traditional testing. Percy automates this by visually comparing UI changes with precision and speed. It's an essential tool for any modern web development workflow that values UI consistency and quality assurance.

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