name: Stryker Mutation Testing description: Stryker mutation testing for assessing test suite quality and effectiveness allowed-tools:

• Bash
• Read
• Write
• Edit
• Glob
• Grep

Stryker Mutation Testing Skill

Overview

This skill provides expert-level capabilities for Stryker-based mutation testing, enabling test quality assessment by introducing code mutations and measuring test effectiveness.

Capabilities

Mutation Execution

• Configure Stryker for JavaScript/TypeScript
• Execute mutation testing runs
• Configure mutation operators

Score Analysis

• Analyze mutation score
• Track killed vs survived mutants
• Identify weak test assertions

Configuration

• Configure mutators and test runners
• Set up file patterns for mutation
• Configure timeout settings

Reporting

• Generate HTML mutation reports
• Dashboard integration for tracking
• CI/CD report generation

Optimization

• Configure incremental mutation testing
• Optimize mutation runs for large codebases
• Parallel mutation execution

Test Quality Insights

• Identify gaps in test coverage
• Recommend assertion improvements
• Prioritize test enhancements

Target Processes

• mutation-testing.js - Mutation testing implementation
• quality-gates.js - Mutation score gates
• shift-left-testing.js - Early test quality validation

Dependencies

• @stryker-mutator/core - Stryker core
• Test runner plugins (jest-runner, karma-runner)
• Reporter plugins

Usage Example

{
  kind: 'skill',
  skill: {
    name: 'stryker-mutation',
    context: {
      action: 'execute',
      configFile: 'stryker.conf.json',
      mutate: ['src/**/*.ts'],
      thresholds: {
        high: 80,
        low: 60,
        break: 50
      }
    }
  }
}

Configuration

The skill uses stryker.conf.json or stryker.conf.js and supports incremental testing for faster feedback.