vitest

Identify valid Skill Units and extract metadata into a YAML document.

Updated Feb 5, 2026
One-click install
npx skills add https://github.com/mguinada/ai-coding-toolkit --skill vitest-mguinada
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/mguinada/ai-coding-toolkit/tree/main/skills/vitest
Command: npx skills add https://github.com/mguinada/ai-coding-toolkit --skill vitest-mguinada

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides fast, integrated testing for JavaScript and TypeScript projects, covering unit testing, component testing, and browser/E2E testing with a cohesive workflow and rich tooling support.

Core Features & Use Cases

  • Fast, native ESM testing for modern frameworks (React/Vue/Svelte) and Vite-powered projects
  • Built-in mocking, snapshots, code coverage, timer control, and type testing with expectTypeOf
  • Supports in-source testing, parallelism, reporters, and CI/CD integration for scalable workflows
  • Use cases include unit tests, component tests, browser-mode tests, and end-to-end testing across JS/TS stacks

Quick Start

Install Vitest in your project and begin writing tests.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I run unit and component tests for a Vite-powered TypeScript project?

Vitest provides fast, native ESM unit and component testing for Vite-powered TypeScript projects. You can install Vitest and immediately begin writing tests to execute cohesive testing workflows across modern frameworks like React, Vue, and Svelte.

What's the best way to handle mocking and code coverage in JavaScript testing?

The best way to handle mocking and code coverage in JavaScript testing is using Vitest, which offers built-in mocking, snapshots, and code coverage tools. It integrates these features natively, streamlining your test workflow without external dependencies.

Does Vitest support browser-mode and E2E testing for modern frameworks?

Yes, Vitest supports browser-mode and end-to-end testing for modern frameworks. It extends its cohesive testing workflow beyond unit and component tests, allowing you to validate end-to-end behavior across JavaScript and TypeScript stacks.

Can I use in-source testing and parallel execution for scalable CI/CD workflows?

Yes, you can use in-source testing and parallel execution in Vitest for scalable CI/CD workflows. Vitest supports parallel test runs and multiple reporters, ensuring fast feedback loops and seamless continuous integration for JavaScript and TypeScript applications.

How does type testing with expectTypeOf work in a TypeScript testing setup?

Type testing with expectTypeOf in Vitest allows you to assert TypeScript types directly within your test suite. This built-in feature ensures your type definitions remain valid during unit testing, catching type errors early in development.

When do I need timer control and snapshots in my unit testing workflow?

You need timer control and snapshots in unit testing when validating time-dependent logic or tracking UI component output changes. Vitest includes built-in timer control and snapshot testing to manage these scenarios efficiently within JavaScript projects.