Vitest in 2026: The Testing Framework That Makes You Actually Want to Write Tests

Vitest is a Vite-powered unit testing framework that offers 10-20x faster performance than Jest, zero configuration for Vite projects, and a Jest-compatible API for easy migration. It provides native TypeScript support, HMR-based test re-running, and powerful mocking capabilities including module mocking, function spying, and global stubbing.