vitest

Write and run unit tests for Vue and React components with Vitest.

610|93|Updated Jan 16, 2026
One-click install
npx skills add https://github.com/partme-ai/full-stack-skills --skill vitest-partme-ai
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/partme-ai/full-stack-skills/tree/main/skills/vitest
Command: npx skills add https://github.com/partme-ai/full-stack-skills --skill vitest-partme-ai

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides a comprehensive guide and examples for Vitest, a fast Vite-native unit testing framework, enabling developers to write and run tests efficiently within their Vite projects.

Core Features & Use Cases

  • Fast Test Execution: Offers rapid test execution with features like watch mode and HMR.
  • Vite Integration: Seamlessly integrates with Vite projects, leveraging the same configuration.
  • Component Testing: Supports testing Vue, React, and Svelte components.
  • Browser Mode: Allows testing in actual browser environments.
  • Mocking & Snapshots: Provides robust mocking capabilities and snapshot testing.
  • Use Case: When developing a new feature in a Vue project, use Vitest to write unit tests for your components and utility functions, ensuring they work as expected before deployment.

Quick Start

Use the vitest skill to write a basic unit test for a JavaScript function.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I configure Vitest for unit testing in an existing Vite project?

Vitest seamlessly integrates with Vite projects by leveraging the same configuration, allowing you to run fast unit tests without duplicating your Vite setup. You can directly extend your current Vite configuration file to define test environments.

Can I test Vue and React components using Vitest?

Vitest supports component testing for Vue, React, and Svelte components within your Vite projects. You can write and execute tests for your UI components to ensure they render and behave as expected before deployment.

What is the best way to speed up unit test execution in JavaScript?

Vitest provides fast test execution for JavaScript and TypeScript by utilizing Vite's native transformations and offering features like watch mode and Hot Module Replacement (HMR). This ensures rapid feedback during development.

Does Vitest support mocking and snapshot testing for TypeScript?

Vitest provides robust mocking capabilities and snapshot testing for TypeScript and JavaScript projects. You can mock modules and capture component outputs to track regressions and ensure function stability across changes.

How do I run component tests in a real browser environment?

Vitest offers a browser mode that allows testing components in actual browser environments rather than relying solely on Node.js simulations. This ensures your tests execute under realistic DOM and API conditions.

Why should I choose Vitest over other JavaScript testing frameworks for Vite?

Vitest is a Vite-native unit testing framework that eliminates the need for separate configurations by reusing your Vite pipeline. This integration delivers faster test execution and a streamlined setup compared to other category-level testing tools.