vitest

Run Vitest unit tests for JavaScript and TypeScript projects.

Updated Jan 31, 2026
One-click install
npx skills add https://github.com/Chrizpy/royalletters --skill vitest-chrizpy
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/Chrizpy/royalletters/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/Chrizpy/royalletters --skill vitest-chrizpy

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill streamlines the process of writing, running, and debugging tests for Vite-powered applications, ensuring code quality and reliability with a fast, modern testing experience.

Core Features & Use Cases

  • Rapid Test Execution: Leverages Vite's build capabilities for near-instantaneous test startup and updates.
  • Jest-Compatible API: Allows developers to use familiar Jest syntax and features.
  • Comprehensive Tooling: Includes mocking, snapshotting, coverage, and type-checking support.
  • Use Case: Quickly write unit tests for a Svelte component, ensuring its props and events function as expected, and then run them in parallel with other component tests for rapid feedback during development.

Quick Start

Use the vitest skill to run all tests in the project.

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 using a Jest-compatible API?

You can run unit tests for a Vite project using a Jest-compatible API by leveraging this Vite-native framework. It provides familiar Jest syntax while utilizing Vite's build capabilities for near-instantaneous test startup and updates.

Does Vitest support TypeScript and JavaScript mocking and snapshotting?

Yes, Vitest supports TypeScript and JavaScript mocking, snapshotting, and code coverage analysis. These comprehensive tooling features are built-in, ensuring robust testing workflows for modern projects.

What is the best way to speed up unit test execution in modern JavaScript applications?

The best way to speed up unit test execution is using a Vite-native framework that runs tests in parallel. It leverages Vite's build capabilities to provide near-instantaneous test startup and rapid feedback during development.

Can I use Vitest to run tests in parallel for Svelte components?

Yes, you can use Vitest to test Svelte components and run them in parallel with other component tests. This allows you to quickly verify that props and events function as expected during development.

Does this Vite-native testing framework support advanced features like filtering and custom fixtures?

Yes, this Vite-native testing framework supports advanced testing features including concurrency, filtering, and custom fixtures. These features facilitate efficient test writing and execution for robust testing workflows.