testing-mutation

Automate mutation testing to reveal weak tests and guide assertion hardening.

7|Updated Feb 14, 2026
One-click install
npx skills add https://github.com/KentoShimizu/sw-agent-skills --skill testing-mutation
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: testing-mutation
Source: https://github.com/KentoShimizu/sw-agent-skills/tree/main/skills/testing-mutation
Command: npx skills add https://github.com/KentoShimizu/sw-agent-skills --skill testing-mutation

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Mutation testing exposes weak assertions by injecting faults to reveal gaps in coverage, helping teams increase confidence in their test suites.

Core Features & Use Cases

  • Surfaces surviving mutants and triages failures to guide assertion hardening.
  • Generates remediation plans, verification checklists, and risk-informed scoring for tests.
  • Use case: strengthen critical-path modules where pass-only results mask real robustness gaps.

Quick Start

Run mutation analysis against the current test suite to identify surviving mutants and guide test hardening.

Frequently Asked Questions about testing-mutation

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

FAQPage Schema
What is mutation testing and how does it reveal weak assertions?

Mutation testing injects faults into source code to expose weak assertions and reveal coverage gaps. It identifies surviving mutants that pass your suite, guiding targeted assertion hardening to increase confidence in test robustness.

How do I strengthen a test suite when tests pass but confidence remains low?

Automate mutation testing against critical modules to surface surviving mutants. The analysis triages failures and generates a remediation plan with verification checklists to guide assertion hardening and strengthen your test suite.

Can I configure mutation testing scopes to target specific critical modules?

Yes, mutation testing supports configurable mutation scopes and budgets. You can restrict analysis to critical-path modules where pass-only results mask real robustness gaps, optimizing execution time and focusing remediation efforts.

What is the best way to analyze surviving mutants in a software project?

Automated mutation testing surfaces surviving mutants and triages failures to guide assertion hardening. It delivers a mutation report, risk-informed scoring for tests, and a verification checklist to prioritize remediation actions.

Does mutation testing work with existing test suites or do I need to write new tests first?

Mutation testing targets software projects with existing test suites. It evaluates current test robustness by injecting faults, revealing surviving mutants, and generating a remediation plan to guide assertion hardening for your tests.

When should I not use mutation testing for test quality assurance?

Mutation testing is less effective without an existing test suite or for non-critical modules. It targets critical-path scenarios where pass-only results mask robustness gaps, so avoid using it on untested code or low-risk areas with limited budget.