vitest

Run JavaScript/TypeScript unit tests integrated with Vite's build system.

4|Updated May 1, 2026
One-click install
npx skills add https://github.com/HigorAlves/orc --skill vitest-higoralves
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/HigorAlves/orc/tree/main/orc/skills/vitest
Command: npx skills add https://github.com/HigorAlves/orc --skill vitest-higoralves

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires @vitest/coverage-v8, vite, and includes references (resource) and assets (resource) components.

What problem does it solve?

This Skill enables rapid, integrated unit testing in JavaScript and TypeScript projects using Vite's build system, facilitating efficient test development and execution.

Core Features & Use Cases

  • Test execution: Run fast unit tests with hot module replacement support during development.
  • Mocking and fixtures: Support for mocking modules, functions, timers, and environment variables.
  • Advanced assertions: Snapshot testing, type safety, and coverage analysis for comprehensive testing.
  • Use Case: When developing a frontend component library, quickly write and run unit tests, leverage snapshots, and get coverage reports to ensure quality.

Quick Start

Use the vitest CLI to run all tests in your project with coverage reporting enabled.

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 project with coverage reporting?

To run unit tests for a Vite project with coverage, use a Vite-native testing framework that provides fast execution, built-in assertions, and coverage analysis via the CLI.

Can I use Jest-compatible assertions and mocks in a Vite testing environment?

Yes, you can use Jest-compatible assertions and mocks in a Vite testing environment, as this testing framework supports mocking modules, functions, timers, and snapshot testing.

What is the best way to execute TypeScript unit tests with hot module replacement?

Executing TypeScript unit tests with hot module replacement is best achieved by using a testing framework that integrates directly with Vite's build system for fast iterative workflows.

Does Vite support snapshot testing and type assertions for frontend component libraries?

Vite supports snapshot testing and type assertions for frontend component libraries through integrated testing frameworks that offer advanced assertions and type safety features.

How do I mock environment variables and modules during JavaScript unit testing?

You can mock environment variables and modules during JavaScript unit testing by utilizing the built-in mocking and fixtures support provided by the testing framework.

Do I need Vite installed to run fast unit tests with this framework?

Yes, you need Vite installed, as this testing framework requires Vite and coverage-v8 dependencies to provide fast execution and comprehensive coverage analysis.