vitest

Run Jest-compatible unit tests in Vite-powered JavaScript and TypeScript projects.

1|Updated Aug 3, 2025

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

Ready to run

npx skills add https://github.com/devjaime/orienta-ai --skill vitest-devjaime

💬 Prompt for ChatGPT / Claude Chat▼

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

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, Vite-powered unit testing framework with a Jest-compatible API, addressing the need for rapid feedback in modern JavaScript/TypeScript projects.

Core Features & Use Cases

Jest-compatible API: test, describe, expect, mocks, and matchers, easing migration from Jest.
Vite-native, fast execution: leverages Vite's transform pipeline for rapid test runs and HMR-like updates during development.
Built-in coverage and fixtures: integrated coverage reporting and fixture APIs for reliable testing across apps.
Use Case: ideal for testing React/Vue/Svelte components in Vite-based projects with minimal setup and great DX.

Quick Start

Install Vitest: npm install -D vitest
Run tests: npx vitest

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 in a Vite project with native ESM support?▼

You can run unit tests in a Vite project with native ESM support by using a Vite-native framework. It leverages Vite's transform pipeline for rapid execution and parallel test runs without requiring complex configuration.

What is the best way to migrate Jest-compatible tests to a Vite-powered workflow?▼

The best way to migrate Jest-compatible tests to a Vite-powered workflow is using a framework with a matching API. It supports familiar test, describe, expect, mocks, and matchers, easing migration from Jest while utilizing Vite's fast execution.

Does Vite provide built-in coverage reporting for component unit testing?▼

Vite itself does not, but Vite-native testing frameworks provide built-in coverage reporting and fixture APIs. This ensures reliable testing across React, Vue, and Svelte components with minimal setup.

Can I use Jest-compatible matchers and mocks for rapid feedback during development?▼

Yes, you can use Jest-compatible matchers and mocks for rapid feedback. A Vite-powered testing framework provides HMR-like updates during development, allowing for immediate test feedback and efficient mocking.

How do I configure project-level settings for parallel test execution in modern JavaScript apps?▼

You configure project-level settings for parallel test execution by using a vitest.config file. This setup targets modern JavaScript and TypeScript apps, enabling native ESM support and fast feedback across development and CI workflows.