This article was originally published on AI Study Room . For the full version with working code examples and related articles, visit the original post. Vitest vs Jest vs Bun Test (2026): JavaScript Test Runner Comparison The JavaScript test runner landscape has transformed since 2024. Vitest (Vite-native, Jest-compatible) has overtaken Jest in new projects, and Bun Test offers blazing-fast execution by leveraging Bun's JavaScript engine. Each has a distinct philosophy: Jest prioritizes stability and ecosystem, Vitest prioritizes speed and Vite integration, and Bun Test prioritizes raw performance.…