Vitest

Playwright

microsoft/playwright

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Microsoft's cross-browser end-to-end testing and automation framework; the E2E standard.

Jest

jestjs/jest

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Long-standing JavaScript test runner with snapshots and mocking; still huge, though Vitest wins new projects.

Testing Library

testing-library/react-testing-library

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User-centric DOM testing utilities for React, Vue, Angular and Svelte that query like users do.

Storybook

storybookjs/storybook

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Workshop for building, documenting and testing UI components in isolation.

Cypress

cypress-io/cypress

Developer-friendly E2E and component testing in a real browser with time-travel debugging.

MSW

mswjs/msw

Popular

Mock Service Worker: intercepts network requests to mock APIs in tests, Storybook and the browser.

Lighthouse

GoogleChrome/lighthouse

Google's automated auditing for performance, Core Web Vitals, accessibility and SEO.

Mocha

mochajs/mocha

Flexible, long-standing Node.js test framework usually paired with Chai and Sinon; common in older codebases.

Chai

chaijs/chai

BDD/TDD assertion library (expect, should, assert) used with Mocha and bundled into Vitest.