vitest

Run Vite-native unit and integration tests with a Jest-compatible API.

1|Updated Jan 10, 2026
One-click install
npx skills add https://github.com/Tinkerbells/atlas --skill vitest-tinkerbells
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/Tinkerbells/atlas/tree/main/apps/shell/.agents/skills/vitest
Command: npx skills add https://github.com/Tinkerbells/atlas --skill vitest-tinkerbells

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Vitest provides a fast, Vite-native testing framework for unit and integration tests, simplifying configuration and enabling Jest-compatible APIs.

Core Features & Use Cases

  • Vite-native test execution for rapid feedback in Vite projects
  • Jest-compatible API surface with describe/it, mocks (vi.fn, vi.mock), and assertions
  • Supports TypeScript, parallel test execution, and customizable coverage thresholds
  • Use Case: when developing Vue/React/Svelte apps, run unit and integration tests during development or CI

Quick Start

Install vitest as a dev dependency and run your first test suite to verify setup.

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 integration tests for my Vite project?

You can run unit and integration tests for your Vite project using Vitest, a Vite-native testing framework that provides Jest-compatible APIs and executes tests in parallel for rapid feedback during development or CI.

Does Vitest support TypeScript out of the box?

Yes, Vitest supports TypeScript natively. You can configure your testing environment using a vitest.config.ts or vite.config.ts file to define settings like coverage thresholds and test execution rules.

How do I mock functions and modules in Vite tests?

You can mock functions and modules in Vite tests using the built-in vi.fn and vi.mock methods. These Jest-compatible mocking utilities allow you to isolate components and control dependencies during unit testing.

Can I test Vue, React, and Svelte components with Vitest?

Yes, Vitest supports component testing for Vue, React, and Svelte applications. It leverages Vite-native test execution to provide fast feedback while running your UI component test suites.

What is the best way to migrate from Jest to a Vite-native testing setup?

Migrating to Vitest is the best way to achieve a Vite-native testing setup because it offers a Jest-compatible API surface with familiar describe and it blocks, allowing you to transition your test suites without rewriting assertions.

How do I configure coverage thresholds for my test suite?

You can configure coverage thresholds for your test suite by defining the settings in your vitest.config.ts or vite.config.ts file. Vitest allows you to customize these limits to enforce code coverage standards in your CI pipeline.