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mutation-testing

Validate test suite effectiveness by introducing code mutations and measuring detection.

1|Updated Dec 29, 2025
Search Tags:#code coverage#test quality#mutation testing#stryker#test effectiveness#kill rate
One-click install
npx skills add https://github.com/aquariuscook/Agent_Modus_Map --skill mutation-testing-aquariuscook
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: mutation-testing
Source: https://github.com/aquariuscook/Agent_Modus_Map/tree/main/.claude/skills/mutation-testing
Command: npx skills add https://github.com/aquariuscook/Agent_Modus_Map --skill mutation-testing-aquariuscook

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill addresses the critical problem of ensuring your test suites are truly effective at catching bugs, not just passing superficial checks. It validates test quality by assessing their ability to detect code changes.

Core Features & Use Cases

  • Test Quality Validation: Quantify the effectiveness of your test suite using mutation testing metrics like the mutation score.
  • Identify Weak Tests: Pinpoint specific tests that fail to detect introduced code mutations, indicating gaps in assertions or logic.
  • Improve Test Effectiveness: Receive actionable recommendations and generated test cases to strengthen your test suite and increase its bug-catching capability.
  • Use Case: Before a major release, use this Skill to run mutation testing on your critical modules. If the mutation score is below 80%, the Skill will identify the surviving mutants and suggest specific tests to improve coverage and assertion strength, ensuring your tests actually catch bugs.

Quick Start

Use the mutation-testing skill to analyze the test suite for the 'src/payment.ts' file and generate missing tests for surviving mutants.

Frequently Asked Questions about mutation-testing

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

FAQPage Schema
How does mutation testing measure test suite effectiveness?▼

Mutation testing measures test suite effectiveness by introducing code mutations and verifying if the tests detect these changes. It calculates a mutation score based on the kill rate of these mutants to quantify test quality.

How do I find weak tests in my codebase?▼

To find weak tests, run mutation testing to introduce code changes and identify surviving mutants. The resulting detailed reports pinpoint specific tests failing to detect mutations, indicating gaps in assertions or logic.

Can I generate new test cases to kill surviving mutants?▼

Yes, you can generate new test cases to kill surviving mutants. The mutation testing process provides actionable insights and suggests specific tests to strengthen your suite and increase its bug-catching capability.

Does mutation testing work with Stryker?▼

Mutation testing works with Stryker to validate test quality. It leverages various mutation operators to introduce code changes and measures the test suite's ability to detect them, providing detailed operator breakdowns and file-level analysis.

What is a good mutation score for a release?▼

A good mutation score for a release is typically 80% or higher. If the score falls below this threshold, mutation testing identifies surviving mutants and suggests specific tests to improve coverage and assertion strength.

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