add-mutation-testing — Claude Code command: what it does
A slash command that sets up mutation testing in your project: picks a framework, wires quality thresholds and hooks the run into CI.
npx claude-code-templates@latest --command testing/add-mutation-testingWhat add-mutation-testing does
Run it with a language flag — --javascript, --java, --python, --rust, --go or --csharp — or let it detect the language from your files. It then picks a framework: Stryker, PIT, mutmut or cargo-mutants.
Six steps follow. Dependencies get installed and basic settings configured, then mutation operators are set up: arithmetic, relational, logical, conditional boundaries. Performance work comes next — parallel execution, incremental runs, file filtering, caching. After that it calculates the mutation score, analyses surviving mutants and enforces thresholds that fail the build.
The command reads and writes files and runs shell commands: Read, Write, Edit and Bash are allowed. Make sure your tests exist and pass before running it, because mutation testing leans on the suite you already have and shows nothing on an empty one. For CI it looks for .github, .gitlab-ci.yml or Jenkinsfile and adds the run there.
What it helps with
- pick a mutation testing framework for the project's language
- configure mutation operators and a mutation score threshold
- speed up runs with parallel execution and caching
- add mutation testing to the CI pipeline
- work through surviving mutants to find missing tests
Example prompts for the agent
- /add-mutation-testing --python
- /add-mutation-testing --javascript
- set up mutation testing for this project and wire it into CI
How to install add-mutation-testing
1claude-code-templates
npx claude-code-templates@latest --command testing/add-mutation-testing2Manually: put the files in place
.claude/commands/add-mutation-testing.mdCall it with /add-mutation-testing. For all projects use ~/.claude/commands/
Manually: put the files in place
~/.codex/prompts/add-mutation-testing.mdCall it with /prompts:add-mutation-testing. Codex marks this format deprecated in favour of skills
Manually: put the files in place
.github/prompts/add-mutation-testing.prompt.mdManually: put the files in place
.gemini/commands/add-mutation-testing.tomlGemini stores commands as TOML: the prompt text goes into the prompt field
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Everything for Testing and QA →Questions about add-mutation-testing
How do I install add-mutation-testing in Claude?
Run npx claude-code-templates@latest --command testing/add-mutation-testing. The command file lands at .claude/commands/add-mutation-testing.md.
What does add-mutation-testing do?
It selects a mutation testing framework for your language, configures operators and mutation score thresholds, optimises the run and integrates it with CI.
Which languages does the command support?
JavaScript, Java, Python, Rust, Go and C#, passed as --javascript, --java, --python, --rust, --go or --csharp. Without a flag it detects the language from project files.
Source text
add-mutation-testing.md · MIT
--- allowed-tools: Read, Write, Edit, Bash argument-hint: "[language] | --javascript | --java | --python | --rust | --go | --csharp" description: Setup comprehensive mutation testing with framework selection and CI integration --- # Add Mutation Testing Setup mutation testing framework with quality metrics and CI integration: **$ARGUMENTS** ## Current Testing Context - Language: !`find . -name "*.js" -o -name "*.ts" | head -1 >/dev/null && echo "JavaScript/TypeScript" || find . -name "*.py" | head -1 >/dev/null && echo "Python" || find . -name "*.java" | head -1 >/dev/null && echo "Java" || echo "Multi-language"` - Test coverage: !`find . -name "coverage" -o -name ".nyc_output" | head -1 || echo "No coverage data"` - Test framework: !`grep -l "jest\\|mocha\\|pytest\\|junit" package.json pom.xml setup.py 2>/dev/null | head -1 || echo "Detect from tests"` - CI system: !`find . -name ".github" -o -name ".gitlab-ci.yml" -o -name "Jenkinsfile" | head -1 || echo "No CI detected"` ## Task Implement comprehensive mutation testing with framework optimization and quality gates: **Language Focus**: Use $ARGUMENTS to specify JavaScript, Java, Python, Rust, Go, C#, or auto-detect from codebase **Mutation Testing Framework**: 1. **Tool Selection & Setup** - Choose framework (Stryker, PIT, mutmut, cargo-mutants), install dependencies, configure basic settings, validate installation 2. **Mutation Operator Configuration** - Configure arithmetic operators, relational operators, logical operators, conditional boundaries, statement mutations 3. **Performance Optimization** - Setup parallel execution, configure incremental testing, optimize file filtering, implement caching strategies 4. **Quality Metrics** - Configure mutation score calculation, setup survival analysis, implement threshold enforcement, track effectiveness trends 5. **CI/CD Integration** - Automate execution triggers, configure performance monitoring, setup result reporting, implement deployment gates 6. **Result Analysis** - Setup visualization dashboards, configure surviving mutant analysis, implement remediation workflows, track regression patterns **Advanced Features**: Selective mutation testing, performance profiling, automated test improvement suggestions, mutation trend analysis, quality gate integration. **Framework Support**: Language-specific optimizations, tool ecosystem integration, performance tuning, reporting customization. **Output**: Complete mutation testing setup with configured framework, CI integration, quality thresholds, and analysis workflows.
© davila7 · MIT · davila7/claude-code-templates
