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mutation-testing - Mutation Testing for Test Effectiveness

Applies code mutations, runs tests, and reports killed or surviving mutants to identify weak or missing tests.

Tags

Updated: 2026-10-04
mutation testingtest effectivenesstest coveragetest qualityTDDJavaScriptTypeScript

Capabilities

Identify changed codeApply targeted mutationsRun the test suiteEvaluate mutant results

Typical Inputs

Branch code changesProduction source codeTest suite

Typical Outputs

Mutation testing reportKilled-mutant findingsSurviving-mutant findings

What this skill does

  • Identify changed code
  • Apply targeted mutations
  • Run the test suite
  • Evaluate mutant results
  • Revert each mutation
  • Report mutation findings
  • Strengthen surviving-mutant tests

Inputs

  • Branch code changes
  • Production source code
  • Test suite
  • Git diff
  • Mutation operators

Outputs

  • Mutation testing report
  • Killed-mutant findings
  • Surviving-mutant findings
  • New or strengthened tests
  • Restored production code

Requirements

  • Git repository
  • Runnable test suite
  • Permission to modify source files
  • Permission to run tests

Source

  • Spec: SKILL.md

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