⚡ Playwright Performance Bottleneck Solved: How do you implement an efficient and robust authentication strategy in Playwright for E2E tests, minimizing setup time and ensuring reliability across test runs? 📌 Problem Statement Many E2E test suites suffer from slow execution and flakiness due to repetitive login flows. ❌ Running full UI login steps before every test suite or spec significantly increases test duration. ❌ UI interactions for login can be unstable, leading to unreliable tests that fail intermittently. The goal is to authenticate once and reuse the session efficiently. 💡 Solution & Code Walkthrough Playwright offers browserContext.storageState() combined with global-setup to create a reusable authentication state. This approach captures cookies, local storage, and session storage after a successful login, allowing subsequent tests to start with an authenticated session. • Step 1: Configure global-setup in playwright.config.ts Define a setup file that runs once before all tests. // playwright.config.ts import { defineConfig } from '@playwright/test'; import path from 'path'; export default defineConfig({ globalSetup: require.resolve('./global-setup'), // Path to setup file projects: [ { name: 'chromium', use: { // Use the saved authentication state storageState: 'playwright-auth-state.json', }, }, // ... other projects ], }); • Step 2: Implement Authentication Logic in global-setup.ts This file performs the login and saves the browser's state. // global-setup.ts import { chromium, FullConfig } from '@playwright/test'; async function globalSetup(config: FullConfig) { const browser = await chromium.launch(); const page = await browser.newPage(); // ✅ Navigate to login and perform actions await page.goto('https://example.com/login'); // Your app's login page await page.fill('#username-input', 'testuser'); await page.fill('#password-input', 'testpass'); await page.click('#login-button'); // ✅ Wait for successful login (e.g., redirect to dashboard) await page.waitForURL('/dashboard'); // ✅ Save the authentication state to a file const storageStatePath = config.projects[0].use?.storageState as string; await page.context().storageState({ path: storageStatePath }); await browser.close(); } export default globalSetup; • All subsequent tests (playwright.config.ts projects property) using the configured storageState will automatically load this session, bypassing the login UI. 🔑 Key Takeaways ✅ Speed: Dramatically reduces test execution time by logging in only once. ✅ Reliability: Eliminates flaky UI interactions on login forms. ✅ Maintainability: Centralizes login logic, making it easier to update credentials or login flows. • Use global-setup for "before all tests" setup. • browserContext.storageState() captures and serializes the session (cookies, local/session storage). • Ensure your selectors (#username-input, #login-button) are robust. ❓ Quick Summary Q&A • Q: Why use global-setup for authentication? A: It runs once before all tests, ensuring the auth state is captured and available for every test suite without repetition. • Q: What does storageState capture? A: It captures the current browser context's cookies, local storage, and session storage. • Q: How do tests use the saved state? A: By configuring use: { storageState: 'your-auth-state.json' } in playwright.config.ts or directly in test files. TAGS: playwright, e2e testing, automation, authentication, performance, typescript, sdet ──────────────────────────────────────── ──────────────────────────────────────── 📲 𝐅𝐑𝐄𝐄 𝐌𝐎𝐁𝐈𝐋𝐄 𝐀𝐏𝐏 — 𝟔𝟎𝟎+ 𝐒𝐃𝐄𝐓 𝐐&𝐀𝐬 Practice real-world interview scenarios offline on the free QA Automation & SDET Prep app: 🤖 𝐆𝐨𝐨𝐠𝐥𝐞 𝐏𝐥𝐚𝐲 (𝐀𝐧𝐝𝐫𝐨𝐢𝐝): https://play.google.com/store/apps/details?id=com.app.seleniuminterviewquestions&referrer=utm_source%3Ddevto%26utm_medium%3Darticle%26utm_campaign%3Dselenium_20260914 🍎 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 (𝐢𝐎𝐒): https://apps.apple.com/app/id6786760948?pt=128640464&ct=devto_selenium_20260914&mt=8 ──────────────────────────────────────── ────────────────────────────────────────