Pure Test vs Vitest

Pure Test is a free, minimal test runner for projects using JavaScript runtimes and browsers. It supports Node.js, Deno, Bun, Cloudflare Workers, and browsers, and its API includes test suites, assertions, lifecycle hooks, spies, fake timers, and retry and timeout options. The CLI provides multiple reporters, test filters, file watching, sharding, and fail-fast execution. For CI, `--shard` splits test files across jobs and exits cleanly when a shard has no files. TypeScript test discovery requires `--ts` on Node.js; it is automatic on Deno and Bun. A Deno adapter registers tests as `Deno.test()` calls for use with `deno test` and its filtering and IDE workflows. The README includes migration guides for Jest and Vitest and notes compatibility with common mock methods. Pure Test does not isolate tests, so lifecycle hooks are recommended for managing state. The project is beta, and its APIs may change. It is Apache-2.0 licensed, with no paid plans stated.

Vitest is a free and open-source testing framework powered by Vite, though it can also run without Vite. It can reuse Vite configuration, plugins, resolvers, and transform pipelines. Jest-compatible APIs cover assertions, snapshots, and mocking, which can support migration from Jest. Watch mode reruns tests related to changed source or test files, and TypeScript, JSX, and ES modules work out of the box. Browser Mode runs tests in a browser and supports Playwright and WebdriverIO providers. Component testing covers Vue, React, Svelte, Lit, Marko, and other frameworks. Vitest supports coverage through V8 or Istanbul, benchmarking powered by Tinybench, parallel execution, parameterized cases, and property-based checks. An official Visual Studio Code extension is available, and the framework can be tried in StackBlitz without local installation. The listed requirements are Vite 6.4.0 or later and Node 22.12.0 or later. Help is available through the Vitest Discord community and GitHub Discussions.