SmartUI Visual Regression Skill

Core Patterns

Playwright + SmartUI SDK

const { chromium } = require('playwright');
const { smartuiSnapshot } = require('@lambdatest/smartui-cli');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();

  await page.goto('https://example.com');
  await smartuiSnapshot(page, 'Homepage');

  await page.goto('https://example.com/login');
  await smartuiSnapshot(page, 'Login Page');

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

Selenium + SmartUI

// Take SmartUI screenshot
((JavascriptExecutor) driver).executeScript(
    "smartui.takeScreenshot=Login Page"
);

CLI Execution

# Install
npm install @lambdatest/smartui-cli@latest --save-dev

# Configure
npx smartui config:create smartui.config.json

# Execute
npx smartui exec -- node test.js
# or with Playwright
npx smartui exec -- npx playwright test

smartui.config.json

{
  "web": {
    "browsers": ["chrome", "firefox", "safari"],
    "viewports": [[1920, 1080], [1366, 768], [375, 812]]
  },
  "waitForPageRender": 5000,
  "waitForTimeout": 1000
}

SmartUI with Storybook

npx smartui storybook http://localhost:6006 --config smartui.config.json

Approval Workflow

1. First run creates baseline screenshots
2. Subsequent runs compare against baseline
3. Differences highlighted in dashboard
4. Approve/reject changes in LambdaTest SmartUI dashboard
5. Approved screenshots become new baseline

Anti-Patterns

| Bad | Good | Why |
|-----|------|-----|
| No viewport config | Multiple viewports | Responsive issues |
| No wait for render | waitForPageRender | Incomplete screenshots |
| Screenshot everything | Key pages/components | Noise reduction |
| No approval process | Review diffs in dashboard | Catch regressions |

Cloud Authentication

Set environment variables:

export PROJECT_TOKEN="your-smartui-project-token"   # From SmartUI dashboard
export LT_USERNAME="your-username"                   # For Selenium/Playwright cloud
export LT_ACCESS_KEY="your-access-key"               # For Selenium/Playwright cloud

CLI approach (uses PROJECT_TOKEN):

npx smartui exec -- npx playwright test

Selenium Cloud approach (uses LT_USERNAME/LT_ACCESS_KEY):

// Capabilities include SmartUI options
HashMap<String, Object> ltOptions = new HashMap<>();
ltOptions.put("user", System.getenv("LT_USERNAME"));
ltOptions.put("accessKey", System.getenv("LT_ACCESS_KEY"));
ltOptions.put("build", "SmartUI Build");
ltOptions.put("smartUI.project", "My SmartUI Project");
ChromeOptions options = new ChromeOptions();
options.setCapability("LT:Options", ltOptions);
WebDriver driver = new RemoteWebDriver(
    new URL("https://hub.lambdatest.com/wd/hub"), options);

Quick Reference

| Task | Command |
|------|---------|
| Install | npm install @lambdatest/smartui-cli@latest |
| Init config | npx smartui config:create smartui.config.json |
| Run | npx smartui exec -- |
| Storybook | npx smartui storybook |
| Dashboard | https://smartui.lambdatest.com |

Deep Patterns

For advanced patterns, debugging guides, CI/CD integration, and best practices,
see reference/playbook.md.