Compare test frameworks for automating user interfaces in JavaScript.

Playwright, Cypress, Puppeteer.

Framework	Developer	Browser Support	Parallel Test Execution	Architecture	Features
Playwright	Microsoft	Chromium, Firefox, WebKit	Built-in	Client-server	Auto-wait, tracing, screenshots, videos
Cypress	Cypress, Inc.	Chrome, Firefox (experimental)	Built-in	Browser injection	Live testing, timeline, request mocking
Puppeteer	Google	Chromium	Requires additional tools	DevTools Protocol	Screenshots, PDF generation, SPA testing

Comparison:

• Playwright: Modern, cross-browser, with rich debugging features and broad language support. Well-suited for testing across platforms.
• Cypress: Developer-friendly, integrates with frontend tools, has a powerful interactive UI. Ideal for browser-focused testing but limited in cross-browser support.
• Puppeteer: Low-level API for Chromium control. Great for automation tasks (scraping, report generation) but requires more effort to build a full testing framework.

The choice depends on specific project requirements: cross-browser support, need for parallel execution, type of application (SPA vs. traditional), and team preferences.

// Example test in Playwright
const { test, expect } = require('@playwright/test');

test('homepage has title', async ({ page }) => {
  await page.goto('https://playwright.dev/');
  // Expect the page title to contain 'Playwright'
  await expect(page).toHaveTitle(/Playwright/);
});

// Example test in Cypress
describe('My First Test', () => {
  it('Visits the Kitchen Sink', () => {
    cy.visit('https://example.cypress.io');
    // Check that element with class 'navbar-brand' contains 'Kitchen Sink'
    cy.get('.navbar-brand').should('contain', 'Kitchen Sink');
  });
});

// Simple script in Puppeteer
const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  // Get page title
  const title = await page.title();
  console.log(`Page title: ${title}`);
  await browser.close();
})();