Testing, Quality & Patterns – Learn JavaScript

About Testing, Quality & Patterns

Unit, integration, and E2E testing with modern JS tools plus architecture patterns.

Row Types:

Special Indicators:

Test pure functions first; they’re easiest and fastest.
Prefer data‑testids or roles for resilient selectors.
Keep tests fast; long E2E tests are for happy paths only.

Favorites

No favorites yet. Tap ☆ on any game.

Testing, Quality & Patterns

Jest – Getting Started — Popular JS test runner
Vitest – Guide — Vite‑native unit testing
Testing Library – Docs — DOM/React testing philosophy
Cypress – Learn — E2E testing for the web
Playwright – Getting Started — Cross‑browser E2E tests
OpenAPI – Tutorial — Contract‑first API testing
MSW – Mock Service Worker — Mock network requests in tests
Sinon – Test Spies & Stubs — Spies, stubs, fakes