mutation-testing

Generate code mutants and run tests to identify surviving mutants.

3|3|Updated Jan 18, 2026

Search Tags:#code quality #developer tools #unit testing #ai testing #test coverage #mutation testing

Ready to run

npx skills add https://github.com/CodySwannGT/lisa --skill mutation-testing-codyswanngt

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: mutation-testing
Source: https://github.com/CodySwannGT/lisa/tree/main/.claude/skills/mutation-testing
Command: npx skills add https://github.com/CodySwannGT/lisa --skill mutation-testing-codyswanngt

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill addresses the challenge of ensuring comprehensive and effective unit tests by systematically identifying and fixing gaps in test coverage and assertion logic.

Core Features & Use Cases

AI-Powered Mutation Testing: Generates code mutants to simulate real-world bugs.
Test Gap Identification: Pinpoints areas where existing tests fail to detect introduced defects.
Test Hardening & Generation: Strengthens existing tests or creates new ones to kill surviving mutants.
Use Case: Improve the reliability of your codebase by automatically finding and fixing weaknesses in your unit tests, ensuring they can catch regressions effectively.

Quick Start

Use the mutation-testing skill to analyze and improve tests for the file 'src/utils.ts'.

Frequently Asked Questions about mutation-testing

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

FAQPage Schema

How does AI mutation testing improve unit test quality?▼

AI mutation testing improves unit test quality by generating targeted code mutants to simulate real-world bugs. It runs tests against these mutants to identify surviving defects, then automatically strengthens or creates assertions to kill them.

How do I run mutation testing on specific files or git changes?▼

To run mutation testing, you can provide a specific file path, a directory, or simply default to analyzing git diff changed files. The tool processes the targeted code to generate mutants and validate test coverage.

Do I need git to perform AI mutation testing on my codebase?▼

Git is required for branch management and to default analysis to git diff changed files. Without git, you must explicitly provide a file path or directory to target the mutation testing process.

What is the best way to identify gaps in test coverage using mutation testing?▼

The best way to identify test coverage gaps is by introducing targeted code mutants and executing your test suite. Surviving mutants pinpoint exactly where existing tests fail to detect introduced defects.

How are equivalent mutants detected during mutation testing?▼

Equivalent mutants are detected using AST analysis. This mechanism analyzes the code structure to identify mutations that do not change program behavior, ensuring accurate test gap identification.