UI Regression Pack

The Challenge

Technical Solution

Built a comprehensive visual regression testing framework using Playwright's screenshot comparison capabilities.

import { test, expect } from '@playwright/test';

test('homepage visual regression', async ({ page }) => {
  await page.goto('/');

  // Wait for all animations to complete
  await page.waitForLoadState('networkidle');

  // Full page screenshot comparison
  await expect(page).toHaveScreenshot('homepage.png', {
    maxDiffPixels: 100,
    threshold: 0.2
  });
});

test('component isolation test', async ({ page }) => {
  await page.goto('/components');

  const header = page.locator('header');
  await expect(header).toHaveScreenshot('header.png');
});

Key Implementation Details

• Baseline screenshot management with automatic updates on intentional changes
• Cross-browser testing across Chrome, Firefox, and Safari
• Responsive testing at mobile, tablet, and desktop breakpoints
• Integration with GitHub Actions for CI/CD pipeline
• Slack notifications for failed visual comparisons

Tech Stack

Impact & Results

• Reduced visual bugs in production by 85% through automated regression detection
• Saved 40% of manual QA time previously spent on visual verification
• Enabled confident refactoring with instant feedback on UI changes
• Improved developer experience with clear visual diff reports on PRs
• Faster release cycles with automated visual validation in CI pipeline