vitest

Run Vitest unit tests for Vite apps with watch mode and coverage.

Updated Aug 27, 2026
One-click install
npx skills add https://github.com/cedriking/zenda --skill vitest-cedriking
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/cedriking/zenda/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/cedriking/zenda --skill vitest-cedriking

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest accelerates unit testing for Vite-powered projects by providing a fast, Jest-compatible testing API with seamless integration into Vite's pipeline.

Core Features & Use Cases

  • Jest-compatible API with native ESM, TypeScript, and JSX support
  • Vite-native test runner with fast HMR-like updates
  • Built-in coverage, snapshots, and mocking
  • Filtering, concurrency, multiple environments, and multi-project support for monorepos
  • Use Case: Update a frontend codebase's test suite with minimal configuration and fast feedback loops.

Quick Start

Run Vitest in a project to execute tests with watch mode and reporting.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I run unit testing for a Vite project with TypeScript and JSX?

Unit testing for Vite projects runs natively through Vitest, a test runner providing Jest-compatible APIs with out-of-the-box TypeScript and JSX support. It leverages Vite's pipeline for fast HMR-like updates during watch mode.

Can I use Jest-compatible API tests with native ESM in Vitest?

Yes, Vitest provides a Jest-compatible API supporting native ESM out of the box. Tests written with standard test, describe, it, and expect functions work seamlessly without extra configuration.

How do I configure coverage and mocking for frontend tests in Vitest?

Coverage and mocking are built directly into Vitest. You can configure coverage reporting and use native mocking features alongside snapshots to validate frontend codebase updates with minimal setup.

What is the best way to handle unit testing for monorepos with multiple environments?

The best way to handle monorepo unit testing is using Vitest's built-in multi-project support. It provides filtering, concurrency, and multiple environments to run isolated tests across different packages efficiently.

Does Vitest work without Jest for fast watch mode test updates?

Vitest works independently without Jest, offering an ultra-fast test runner with HMR-like watch mode updates. It integrates directly into Vite's pipeline to deliver fast feedback loops for frontend projects.