playwright-skill

What this skill does

# Playwright Web Testing & Automation

Comprehensive web testing skill using Playwright. Write custom JavaScript code for any testing or automation task.

## Prerequisites

- **Node.js**: required — install from https://nodejs.org
- **playwright** npm package: `npm install playwright` (installs headless Chromium automatically)

## Decision Tree: Choosing Your Approach

```
User task → Is server already running?
    ├─ Yes → Direct Testing
    │   ├─ Static HTML? → Navigate directly (file:// or http://)
    │   └─ Dynamic webapp? → Use Reconnaissance-Then-Action pattern
    │
    └─ No → Server Management Required
        ├─ Single server → Start server, then test
        └─ Multiple servers → Start all servers, coordinate testing
```

## CRITICAL WORKFLOW

1. **CheckTesting  if server is running** - Detect running dev servers OR start servers if needed
2. **Write scripts to /tmp** - NEVER write test files to skill directory; always use `/tmp/playwright-test-*.js`
3. **Use visible browser by default** - Always use `headless: false` unless user specifically requests headless mode
4. **Wait for dynamic content** - Use `waitForLoadState('networkidle')` before inspecting dynamic webapps
5. **Parameterize URLs** - Always make URLs configurable via constant at top of script

## Reconnaissance-Then-Action Pattern

For dynamic webapps where you don't know the DOM structure upfront:

```javascript
// /tmp/playwright-test-reconnaissance.js
const { chromium } = require('playwright');

const TARGET_URL = 'http://localhost:3000';

(async () => {
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();

  // STEP 1: Navigate and wait for dynamic content
  await page.goto(TARGET_URL);
  await page.waitForLoadState('networkidle'); // CRITICAL for dynamic apps

  // STEP 2: Reconnaissance - discover what's on the page
  await page.screenshot({ path: '/tmp/inspect.png', fullPage: true });
  
  const buttons = await page.locator('button').all();
  console.log(`Found ${buttons.length} buttons`);
  
  for (let i = 0; i < buttons.length; i++) {
    const text = await buttons[i].textContent();
    console.log(`  Button ${i}: "${text}"`);
  }

  // STEP 3: Action - interact with discovered elements
  const loginButton = page.locator('button:has-text("Login")');
  if (await loginButton.isVisible()) {
    await loginButton.click();
    console.log('✅ Clicked login button');
  }

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

## Server Management

### Check for Running Servers

```bash
# Check if port is in use
lsof -i :3000  # Mac/Linux
netstat -ano | findstr :3000  # Windows
```

### Start Server Before Testing

```javascript
// /tmp/playwright-test-with-server.js
const { chromium } = require('playwright');
const { spawn } = require('child_process');

const TARGET_URL = 'http://localhost:3000';

(async () => {
  // Start server
  console.log('Starting server...');
  const server = spawn('npm', ['run', 'dev'], { shell: true });
  
  server.stdout.on('data', (data) => console.log(`Server: ${data}`));
  server.stderr.on('data', (data) => console.error(`Server Error: ${data}`));

  // Wait for server to be ready
  await new Promise(resolve => setTimeout(resolve, 3000));

  // Run tests
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();
  
  await page.goto(TARGET_URL);
  await page.waitForLoadState('networkidle');
  
  // Your test logic here
  console.log('Title:', await page.title());
  
  await browser.close();
  
  // Clean up server
  server.kill();
  console.log('✅ Tests complete, server stopped');
})();
```

## Common Patterns

### Test a Page (Multiple Viewports)

```javascript
// /tmp/playwright-test-responsive.js
const { chromium } = require('playwright');

const TARGET_URL = 'http://localhost:3001'; // Auto-detected

(async () => {
  const browser = await chromium.launch({ headless: false, slowMo: 100 });
  const page = await browser.newPage();

  // Desktop test
  await page.setViewportSize({ width: 1920, height: 1080 });
  await page.goto(TARGET_URL);
  console.log('Desktop - Title:', await page.title());
  await page.screenshot({ path: '/tmp/desktop.png', fullPage: true });

  // Mobile test
  await page.setViewportSize({ width: 375, height: 667 });
  await page.screenshot({ path: '/tmp/mobile.png', fullPage: true });

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

### Test Login Flow

```javascript
// /tmp/playwright-test-login.js
const { chromium } = require('playwright');

const TARGET_URL = 'http://localhost:3001'; // Auto-detected

(async () => {
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();

  await page.goto(`${TARGET_URL}/login`);

  await page.fill('input[name="email"]', '[email protected]');
  await page.fill('input[name="password"]', 'password123');
  await page.click('button[type="submit"]');

  // Wait for redirect
  await page.waitForURL('**/dashboard');
  console.log('✅ Login successful, redirected to dashboard');

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

### Fill and Submit Form

```javascript
// /tmp/playwright-test-form.js
const { chromium } = require('playwright');

const TARGET_URL = 'http://localhost:3001'; // Auto-detected

(async () => {
  const browser = await chromium.launch({ headless: false, slowMo: 50 });
  const page = await browser.newPage();

  await page.goto(`${TARGET_URL}/contact`);

  await page.fill('input[name="name"]', 'John Doe');
  await page.fill('input[name="email"]', '[email protected]');
  await page.fill('textarea[name="message"]', 'Test message');
  await page.click('button[type="submit"]');

  // Verify submission
  await page.waitForSelector('.success-message');
  console.log('✅ Form submitted successfully');

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

### Check for Broken Links

```javascript
const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();

  await page.goto('http://localhost:3000');

  const links = await page.locator('a[href^="http"]').all();
  const results = { working: 0, broken: [] };

  for (const link of links) {
    const href = await link.getAttribute('href');
    try {
      const response = await page.request.head(href);
      if (response.ok()) {
        results.working++;
      } else {
        results.broken.push({ url: href, status: response.status() });
      }
    } catch (e) {
      results.broken.push({ url: href, error: e.message });
    }
  }

  console.log(`✅ Working links: ${results.working}`);
  console.log(`❌ Broken links:`, results.broken);

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

### Take Screenshot with Error Handling

```javascript
const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();

  try {
    await page.goto('http://localhost:3000', {
      waitUntil: 'networkidle',
      timeout: 10000,
    });

    await page.screenshot({
      path: '/tmp/screenshot.png',
      fullPage: true,
    });

    console.log('📸 Screenshot saved to /tmp/screenshot.png');
  } catch (error) {
    console.error('❌ Error:', error.message);
  } finally {
    await browser.close();
  }
})();
```

### Test Responsive Design

```javascript
// /tmp/playwright-test-responsive-full.js
const { chromium } = require('playwright');

const TARGET_URL = 'http://localhost:3001'; // Auto-detected

(async () => {
  const browser = await chromium.launch({ headless: false });
  const page = await browser.newPage();

  const viewports = [
    { name: 'Desktop', width: 1920, height: 1080 },
    { name: 'Tablet', width: 768, height: 1024 },
    { name: 'Mobile', width: 375, height: 667 },
  ];

  for (const viewport of viewports) {
    console.log(
      `Testing ${viewport.name} (${viewport.width}x${viewport.height})`,
    );
 & Discovery

```javascript
// Check visibility
const isVisible = await p