Can it help me mock external API calls?

Absolutely. The skill provides detailed patterns for using vi.mock and vi.fn() to isolate your code from external dependencies and third-party modules.

How does it handle test coverage?

It provides ready-to-use configurations for the V8 coverage provider, including setting specific thresholds for lines, functions, and branches.

Does this skill support the Bun runtime?

Yes, it includes optimized commands and configurations specifically for running Vitest with Bun for maximum performance.

Is it compatible with React or Vue projects?

Yes, it includes guidance for setting up jsdom or happy-dom environments, which are necessary for testing frontend frameworks.

Vitest Testing Expert

Name: Vitest Testing Expert
Author: secondsky

bysecondsky

•

Security & Testing

Automates the creation, execution, and optimization of unit and integration tests using the Vitest framework.

This skill equips Claude Code with specialized knowledge for testing TypeScript and JavaScript projects using Vitest, the high-performance testing framework powered by Vite. It provides expert guidance on configuring test environments, implementing complex mocking strategies with the 'vi' utility, and managing code coverage thresholds. By leveraging this skill, developers can ensure their applications are production-ready through standardized testing patterns, native ESM support, and optimized workflows for both Node.js and browser-based environments.

Key Features

0111 GitHub stars

02Automated code coverage reporting with V8 or Istanbul providers

03Standardized patterns for unit, integration, and parameterized testing

04Comprehensive mocking patterns for functions, modules, and system timers

05Native ESM and TypeScript support with Vite-powered execution speed

06Optimized test runner commands for Bun, npm, and interactive UI modes

Use Cases

01Configuring CI/CD pipelines with automated coverage thresholds and reporting

02Generating comprehensive test suites for new TypeScript components or utilities

03Migrating legacy Jest test suites to modern Vitest configurations

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add secondsky/claude-skills vitest-testing

For use in Claude.ai and ChatGPT

Download Skill