vitest

Run Vitest unit and integration tests for Vite-based projects.

Updated Aug 23, 2026

Search Tags:#typescript #vitest #testing #vite #mocking #unit-testing

Ready to run

npx skills add https://github.com/narduk-enterprises/myboat --skill vitest-narduk-enterprises

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/narduk-enterprises/myboat/tree/main/.github/skills/vitest
Command: npx skills add https://github.com/narduk-enterprises/myboat --skill vitest-narduk-enterprises

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Vitest provides a fast, zero-config-friendly testing framework for Vite projects, enabling quick feedback during development and robust CI checks.

Core Features & Use Cases

Jest-compatible API: Use describe/it/expect and familiar mocks (vi.fn, vi.mock) with minimal changes.
Vite-native integration: Deeply integrates with Vite and modern frontend toolchains for seamless workflow.
Parallel & deterministic: Runs tests in parallel with deterministic behavior and configurable isolation.
Coverage & diagnostics: Offers built-in code coverage reports and actionable test diagnostics for quick fixes.

Quick Start

Install Vitest and run your test suites to validate code.

Frequently Asked Questions about vitest

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

FAQPage Schema

How do I set up unit testing for a Vite project?▼

Set up unit testing for a Vite project by configuring vitest.config.ts and using describe/it blocks. This framework provides a zero-config-friendly setup that deeply integrates with Vite to run tests in parallel with deterministic behavior.

Can I use Jest-compatible mocks with vi.fn and vi.mock in Vite testing?▼

Yes, you can use Jest-compatible mocks with vi.fn and vi.mock in Vite testing. The framework supports familiar mocking APIs and timers, allowing you to stub functions and modules with minimal changes from your existing Jest test suites.

Does Vitest support built-in code coverage reporting for Vue and React?▼

Vitest supports built-in code coverage reporting for Vue, React, and Svelte ecosystems. It provides actionable test diagnostics and coverage reports directly within your Vite-native workflow to help identify untested code paths quickly.

What is the best way to run fast and deterministic tests in a Vite environment?▼

The best way to run fast and deterministic tests in a Vite environment is using Vitest. It runs tests in parallel with configurable isolation, leveraging Vite's native toolchain for quick feedback during development and robust CI checks.

Do I need a separate configuration file to run integration testing across Svelte ecosystems?▼

You need a vitest.config.ts file to streamline integration testing across Svelte ecosystems. This setup provides the necessary Vite-native integration to run reliable tests with deterministic behavior and built-in coverage reporting.