#vitest

TL;DR: I built EcoAscent; a gamified eco-awareness app where a hand-drawn SVG world visually decays...

Testing components in a simulated DOM (jsdom, happy-dom) has always felt like a compromise. What we...

I verified practical patterns for mocking Anthropic SDK messages.create() and streaming responses in Vitest 4.1.7. This covers why vi.fn().mockImplementation(function(){...}) differs from arrow functions, how to reproduce SSE streams with async function* generators, and how 9 tests pass in 142ms without a single API call.

A hands-on guide to migrating from Jest to Vitest 4.1.7. Covers installation, config migration, code conversion patterns, and Vitest 4 exclusive features like stable Browser Mode and new matchers (toSatisfy, toBeOneOf) — verified in a real sandbox.

Introduction This is my first article as a Java engineer learning TypeScript from...

Introducing vitest-fail-on-console — why console.warn/error appearing silently in tests is a code smell, and how this package forces you to deal with it.

Speed benchmarks, feature comparison, and migration guides for the three leading JS test runners. Vitest wins on Vite integration; Bun Test wins on raw speed; Jest has the largest ecosystem.

Two developers look at the same untested codebase and reach opposite conclusions. One says "this is...

A deep dive into testing a filesystem service using memfs to replace fs and a hand-written Fake to replace chokidar, making filesystem tests fast, deterministic, and security-aware.

Why manual testing isn't enough and how I set up Vitest and Render to create a fully automated deployment pipeline.

⚠️ この記事はアフィリエイト広告（プロモーション）を含みます。リンク先で発生した収益の一部が運営者に支払われますが、読者の購入価格には一切影響ありません。 By the time you...

Why Playwright + Vitest is the Future of Web Testing Cypress had its moment. Selenium...