Add Mutation Testing

Setup mutation testing for code quality

Instructions

1. Mutation Testing Strategy Analysis

   • Analyze current test suite coverage and quality
   • Identify critical code paths and business logic for mutation testing
   • Assess existing testing infrastructure and CI/CD integration points
   • Determine mutation testing scope and performance requirements
   • Plan mutation testing integration with existing quality gates

2. Mutation Testing Tool Selection

   • Choose appropriate mutation testing framework:
     • JavaScript/TypeScript: Stryker, Mutode
     • Java: PIT (Pitest), Major
     • C#: Stryker.NET, VisualMutator
     • Python: mutmut, Cosmic Ray, MutPy
     • Go: go-mutesting, mut
     • Rust: mutagen, cargo-mutants
     • PHP: Infection
   • Consider factors: language support, performance, CI integration, reporting

3. Mutation Testing Configuration

   • Install and configure mutation testing framework
   • Set up mutation testing configuration files and settings
   • Configure mutation operators and strategies
   • Set up file and directory inclusion/exclusion rules
   • Configure performance and timeout settings

4. Mutation Operator Configuration

   • Configure arithmetic operator mutations (+, -, *, /, %)
   • Set up relational operator mutations (<, >, <=, >=, ==, !=)
   • Configure logical operator mutations (&&, ||, !)
   • Set up conditional boundary mutations (< to <=, > to >=)
   • Configure statement deletion and insertion mutations

5. Test Execution and Performance

   • Configure mutation test execution strategy and parallelization
   • Set up incremental mutation testing for large codebases
   • Configure mutation testing timeouts and resource limits
   • Set up mutation test caching and optimization
   • Configure selective mutation testing for changed code

6. Quality Metrics and Thresholds

   • Set up mutation score calculation and reporting
   • Configure mutation testing thresholds and quality gates
   • Set up mutation survival analysis and reporting
   • Configure test effectiveness metrics and tracking
   • Set up mutation testing trend analysis

7. Integration with Testing Workflow

   • Integrate mutation testing with existing test suites
   • Configure mutation testing execution order and dependencies
   • Set up mutation testing in development and CI environments
   • Configure mutation testing result integration with test reports
   • Set up mutation testing feedback loops for developers

8. CI/CD Pipeline Integration

   • Configure automated mutation testing in continuous integration
   • Set up mutation testing scheduling and triggers
   • Configure mutation testing result reporting and notifications
   • Set up mutation testing performance monitoring
   • Configure mutation testing deployment gates

9. Result Analysis and Remediation

   • Set up mutation testing result analysis and visualization
   • Configure surviving mutant analysis and categorization
   • Set up test gap identification and remediation workflow
   • Configure mutation testing regression tracking
   • Set up automated test improvement recommendations

10. Maintenance and Optimization

    • Create mutation testing maintenance and optimization procedures
    • Set up mutation testing configuration version control
    • Configure mutation testing performance optimization
    • Document mutation testing best practices and guidelines
    • Train team on mutation testing concepts and workflow
    • Set up mutation testing tool updates and maintenance