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vitest

Run and manage unit tests for Vite-based projects with mocking and coverage.

3|Updated Feb 9, 2026
Search Tags:#typescript#vitest#testing#vite#unit-testing#esm#jest-compatible
One-click install
npx skills add https://github.com/marcus-friction/agents --skill vitest-marcus-friction
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/marcus-friction/agents/tree/main/.agent/skills/vitest
Command: npx skills add https://github.com/marcus-friction/agents --skill vitest-marcus-friction

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest addresses the need for fast, reliable unit testing in Vite-based projects by offering an integrated testing framework with a Jest-compatible API, native ESM support, and seamless Vite integration.

Core Features & Use Cases

  • Fast feedback with Vite-native transformation and hot module replacement style updates
  • Jest-compatible API for easy porting of existing suites
  • Built-in coverage, snapshots, mocking, and advanced test APIs for complex suites
  • Use cases include unit tests for frontend components, utilities, and backend logic within a monorepo

Quick Start

Install Vitest in your project and run tests using your preferred package manager.

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-based project with Jest compatibility?▼

Vitest provides Jest-compatible unit testing for Vite-based projects by using Vite-native transformation and hot module replacement style updates to accelerate test execution and feedback loops.

Does Vitest support native ESM for frontend and backend unit testing?▼

Vitest supports native ESM for unit testing across frontend and backend codebases, allowing you to write and run tests with modern JavaScript modules without requiring configuration workarounds.

How do I manage mocks and coverage in Vitest?▼

You can manage mocks and coverage in Vitest by applying its built-in test APIs to configure mock functions, track code coverage, and execute concurrent tests across complex suites.

Can I port existing Jest test suites to a Vite testing framework?▼

You can port existing Jest test suites to Vitest because it offers a Jest-compatible API, allowing you to migrate tests, snapshots, and mocks directly into a Vite-native environment.

What is the best way to test utilities in a monorepo using Vite?▼

The best way to test utilities in a monorepo using Vite is applying Vitest to run integrated unit tests across frontend components and backend logic with fast feedback and reliable execution.

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