vitest

Run Vite-native unit tests with a Jest-compatible API.

13|Updated Feb 4, 2026

Search Tags:#vitest #testing #vite #coverage #fixtures #unit-testing #jest-compatible

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npx skills add https://github.com/abeldotam/bmad-viewer --skill vitest-abeldotam

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Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/abeldotam/bmad-viewer/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/abeldotam/bmad-viewer --skill vitest-abeldotam

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest addresses the need for fast, integrated unit testing in modern web projects, offering a Jest-compatible API built on Vite to speed up feedback loops during development.

Core Features & Use Cases

Vite-native test runner with fast Vite-based transformations and HMR-like test updates
Jest-compatible API for familiar test syntax (test/describe/expect) with native ESM, TypeScript, and JSX support
Built-in coverage and snapshot testing to verify code quality
Flexible configuration and fixtures for scalable test suites across projects
Use Case: When maintaining a large Vue/React app, run unit tests during development to ensure changes don’t break existing behavior.

Quick Start

Install Vitest and run the test suite using your package manager (e.g., npm run test or pnpm test).

Frequently Asked Questions about vitest

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I run unit tests for a Vite project using a Jest-compatible API?▼

Vitest serves as a Vite-native test runner offering a Jest-compatible API, enabling you to write unit tests with native ESM, TypeScript, and JSX support directly within your Vite-based development workflow.

Can I use Vitest for testing Vue and React applications?▼

Yes, Vitest is designed for maintaining large Vue and React apps, providing fast feedback loops during development with HMR-like test updates to ensure code changes do not break existing behavior.

How do I configure code coverage and snapshot testing in Vitest?▼

Vitest includes built-in coverage and snapshot testing features to verify code quality, which can be configured and scaled across projects using a vitest.config.ts file alongside flexible test fixtures.

Does Vitest support watch mode for continuous testing during development?▼

Yes, Vitest features watch mode and HMR-like test updates, enabling rapid feedback by instantly re-running unit tests as you modify your JavaScript or TypeScript codebase during development.

What is the best way to migrate from Jest to a Vite-native test runner?▼

Vitest offers a Jest-compatible API with familiar test syntax, making it a suitable Vite-native alternative for developers seeking faster test execution and native ESM support without rewriting existing test suites.