testing

Find and run Vitest-based unit tests in TypeScript projects.

4|1|Updated Mar 16, 2026
One-click install
npx skills add https://github.com/seasonedcc/vertical --skill testing-seasonedcc
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: testing
Source: https://github.com/seasonedcc/vertical/tree/main/.claude/skills/testing
Command: npx skills add https://github.com/seasonedcc/vertical --skill testing-seasonedcc

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Unit testing is essential for ensuring code reliability and catching regressions early as projects evolve. Vitest-based tests are co-located with source files, enabling fast feedback and easier maintenance during development.

Core Features & Use Cases

  • Co-located tests next to source files (e.g., *.test.ts) for easy maintenance and discovery.
  • Guidance on test-driven development, test structure, and best practices to improve code quality.
  • Use cases include adding new tests for features, debugging failures, and validating test coverage and confidence.

Quick Start

Run the Vitest suite for your project to verify behavior and catch regressions.

Frequently Asked Questions about testing

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

FAQPage Schema
How do I run Vitest unit tests for a TypeScript project?

To run Vitest unit tests, execute the package script configured in your project, which finds and runs co-located test files to validate code behavior and prevent regressions.

What is the best way to structure Vitest tests in a TypeScript project?

The best way to structure Vitest tests is by co-locating test files next to your source files, using a naming convention like *.test.ts, which enables fast feedback and easier maintenance.

Do I need Vitest setup to use test-driven development for TypeScript?

Yes, test-driven development requires Vitest setup in your project, including co-located test files and a package script to run tests, ensuring reliable code validation.

How does co-locating tests next to source files improve unit testing?

Co-locating tests next to source files improves unit testing by keeping tests close to the code they validate, enabling fast feedback and easier maintenance during development.

Why does my Vitest unit testing fail to validate code behavior?

Vitest unit testing may fail to validate code behavior if test files are not properly co-located next to source files or if the package script is incorrectly configured to run tests.