Mutation Test Suite Optimizer

arabelatso/mutation-test-suite-optimizer

Optimize test suites using mutation testing to maximize mutation kill rate with minimal tests. Use when you need to reduce test suite size while maintaining quality, identify redundant tests, improve mutation coverage, or validate test effectiveness. The skill analyzes test coverage, execution intervals, and redundancy using mutation operators, selects or generates a minimal subset of tests that maximizes mutation kill rate, and outputs an optimized test suite with detailed reports showing killed and surviving mutants. Supports multiple programming languages and mutation testing frameworks.

710 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

141

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/ArabelaTso/Skills-4-SE --skill mutation-test-suite-optimizer

The instruction itself

8 sections, as written by the author

Mutation Test Suite Optimizer

Overview

This skill optimizes test suites using mutation testing, selecting a minimal subset of tests that maximizes mutation kill rate while reducing execution time and redundancy.

Quick Start

# Optimize test suite with mutation testing
python scripts/optimize.py /path/to/repo --tests tests/

# Use specific mutation operators
python scripts/optimize.py repo/ --tests tests/ --operators AOR,ROR,COR

# Generate optimization report
python scripts/optimize.py repo/ --tests tests/ --output report.json

What Gets Optimized

Test Selection - Identify minimal test subset for maximum coverage
Redundancy Removal - Eliminate tests that kill same mutants
Mutation Coverage - Maximize mutants killed
Execution Time - Reduce overall test execution time
Test Quality - Identify weak or ineffective tests

Mutation Operators

Supports common mutation operators:

AOR - Arithmetic Operator Replacement
ROR - Relational Operator Replacement
COR - Conditional Operator Replacement
SOR - Shift Operator Replacement
LOR - Logical Operator Replacement
ASR - Assignment Operator Replacement

Optimization Report

Generates detailed report with:

Optimized Test Suite - Minimal test subset
Mutation Kill Rate - Percentage of mutants killed
Killed Mutants - List of detected mutants
Surviving Mutants - Mutants that escaped detection
Redundant Tests - Tests that can be removed
Execution Time Savings - Time reduction achieved

Example report:

{
  "original_tests": 150,
  "optimized_tests": 45,
  "mutation_kill_rate": 92.5,
  "killed_mutants": 185,
  "surviving_mutants": 15,
  "time_savings": "67%"
}

Usage

python scripts/optimize.py <repo_path> --tests <test_dir> [--operators <ops>] [--output <report.json>]

Tips

Run regularly to maintain test suite quality
Focus on high-value tests that kill unique mutants
Remove redundant tests to speed up CI/CD
Use surviving mutants to guide new test creation
Balance mutation score with execution time
Integrate into continuous testing pipeline

How to use it

Copy the folder

Take arabelatso/mutation-test-suite-optimizer from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.