Playwright

Trigger

Use when writing Playwright tests, debugging failures, scraping with Playwright, or setting up CI/CD pipelines.

Selector Priority (Always)

1. getByRole() — accessible, resilient
2. getByTestId() — explicit, stable
3. getByLabel(), getByPlaceholder() — form elements
4. getByText() — visible content (exact match preferred)
5. CSS/XPath — last resort, avoid nth-child and generated classes

Critical Rules

• Never use page.waitForTimeout() — use waitFor* methods or expect with polling
• Always close contexts — browser.close() or context.close() to prevent memory leaks
• Prefer networkidle with caution — SPAs may never reach idle; use DOM-based waits instead
• Use test.describe.configure({ mode: 'parallel' }) — for independent tests
• Trace on failure only — trace: 'on-first-retry' in config, not always-on

Quick Fixes

Scraping Patterns

// Basic scrape with Playwright
const { chromium } = require('playwright');
const browser = await chromium.launch({ headless: true });
const context = await browser.newContext({
  userAgent: 'Mozilla/5.0 (compatible; bot/1.0)'
});
const page = await context.newPage();

await page.goto('https://example.com', { waitUntil: 'domcontentloaded' });

// Wait for specific element
await page.waitForSelector('.article-content');

// Extract data
const data = await page.$$eval('.article', articles =>
  articles.map(a => ({
    title: a.querySelector('h2')?.textContent?.trim(),
    url: a.querySelector('a')?.href,
    date: a.querySelector('time')?.getAttribute('datetime')
  }))
);

await browser.close();

Test Structure (Laravel Dusk compatible)

// playwright.config.ts
import { defineConfig } from '@playwright/test';
export default defineConfig({
  testDir: './tests/e2e',
  timeout: 30_000,
  retries: process.env.CI ? 2 : 0,
  use: {
    baseURL: 'http://localhost',
    trace: 'on-first-retry',
    screenshot: 'only-on-failure',
    video: 'retain-on-failure',
  },
});

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

test('login flow', async ({ page }) => {
  await page.goto('/login');
  await page.getByLabel('Email').fill('user@example.com');
  await page.getByLabel('Password').fill('password');
  await page.getByRole('button', { name: 'Login' }).click();
  await expect(page).toHaveURL('/dashboard');
});

Auth State Persistence

// Save auth state
await page.goto('/login');
await page.getByLabel('Email').fill('admin@example.com');
await page.getByLabel('Password').fill('secret');
await page.getByRole('button', { name: 'Login' }).click();
await page.context().storageState({ path: 'auth.json' });

// Reuse in other tests
const context = await browser.newContext({ storageState: 'auth.json' });

Screenshot / PDF

await page.screenshot({ path: 'screenshot.png', fullPage: true });
await page.pdf({ path: 'page.pdf', format: 'A4' });

Useful CLI Commands

npx playwright test                         # Run all tests
npx playwright test --headed               # With browser visible
npx playwright test --debug                # Debug mode (step-by-step)
npx playwright test --grep "login"         # Filter by test name
npx playwright show-report                 # Open HTML report
npx playwright codegen https://example.com # Record interactions → code