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feat: add mutation testing with Stryker for frontend and backend
Implemented comprehensive mutation testing using Stryker to evaluate and improve test quality beyond standard code coverage metrics. Added: - Separate Stryker configurations for frontend (React Native) and backend (Node.js) - CI/CD integration with GitHub Actions workflow - Incremental mutation testing for PR performance optimization (60-80% faster) - Historical mutation score tracking and trending - Automated PR comments with detailed mutation reports - Equivalent mutant detection and analysis tools - Comprehensive documentation and quick reference guides Features: - 75% mutation score quality gate enforced in CI - Dashboard reporting with HTML, JSON, and markdown outputs - Survived mutant analysis with actionable recommendations - Parallel test execution with configurable concurrency Configuration files: - stryker.conf.json (frontend: src/**, app/**) - stryker.backend.conf.json (backend/**) - .github/workflows/mutation-testing.yml (CI workflow) Scripts: - scripts/run-incremental-mutation.js (git diff-based incremental testing) - scripts/generate-mutation-report.js (aggregated reporting) - scripts/analyze-equivalent-mutants.js (heuristic-based analysis) Documentation: - docs/mutation-testing.md (comprehensive guide) - MUTATION_TESTING_QUICKREF.md (commands and quick reference) - MUTATION_TESTING_IMPLEMENTATION.md (implementation summary) - mutation-reports/README.md (report format documentation) Updated package.json with @stryker-mutator dependencies, added npm scripts for mutation testing workflows, and enhanced CONTRIBUTING.md with mutation testing guidelines and best practices. Closes #416
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‎.github/workflows/mutation-testing.yml‎

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name: Mutation Testing
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on:
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pull_request:
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branches: [main, dev, develop]
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paths:
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- 'src/**/*.ts'
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- 'src/**/*.tsx'
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- 'app/**/*.ts'
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- 'app/**/*.tsx'
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- 'backend/**/*.ts'
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- '**/*.test.ts'
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- '**/*.test.tsx'
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- 'stryker*.conf.json'
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- 'jest*.config.js'
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push:
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branches: [main]
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paths:
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- 'src/**/*.ts'
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- 'src/**/*.tsx'
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- 'app/**/*.ts'
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- 'app/**/*.tsx'
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- 'backend/**/*.ts'
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workflow_dispatch:
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inputs:
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scope:
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description: 'Test scope (frontend, backend, or both)'
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required: true
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default: 'both'
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type: choice
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options:
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- both
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- frontend
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- backend
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incremental:
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description: 'Run incremental mutation testing'
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required: false
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default: true
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type: boolean
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env:
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NODE_VERSION: '20'
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jobs:
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mutation-test:
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name: Mutation Testing
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runs-on: ubuntu-latest
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timeout-minutes: 60
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permissions:
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contents: read
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pull-requests: write
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issues: write
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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with:
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fetch-depth: 0 # Needed for incremental testing
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- name: Setup Node.js
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uses: actions/setup-node@v4
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with:
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node-version: ${{ env.NODE_VERSION }}
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cache: 'npm'
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- name: Cache node modules
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uses: actions/cache@v4
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id: cache-node-modules
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with:
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path: node_modules
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key: ${{ runner.os }}-node-${{ env.NODE_VERSION }}-${{ hashFiles('package-lock.json') }}
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restore-keys: |
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${{ runner.os }}-node-${{ env.NODE_VERSION }}-
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- name: Install dependencies
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if: steps.cache-node-modules.outputs.cache-hit != 'true'
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run: npm ci --legacy-peer-deps
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- name: Cache Stryker incremental files
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uses: actions/cache@v4
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with:
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path: .stryker-tmp
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key: ${{ runner.os }}-stryker-${{ github.sha }}
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restore-keys: |
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${{ runner.os }}-stryker-
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- name: Download previous mutation history
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if: github.event_name == 'pull_request'
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continue-on-error: true
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uses: dawidd6/action-download-artifact@v6
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with:
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workflow: mutation-testing.yml
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branch: main
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name: mutation-history
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path: mutation-reports/
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if_no_artifact_found: ignore
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# Incremental mutation testing for PRs
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- name: Run incremental mutation testing (PR)
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if: github.event_name == 'pull_request' && (github.event.inputs.incremental != 'false')
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run: npm run mutation:test:incremental
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continue-on-error: true
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env:
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GITHUB_BASE_REF: ${{ github.event.pull_request.base.ref }}
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# Full mutation testing for main branch or manual trigger
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- name: Run full frontend mutation testing
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if: (github.event_name == 'push' || github.event.inputs.incremental == 'false') && (github.event.inputs.scope != 'backend')
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run: npm run mutation:test:frontend
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continue-on-error: true
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- name: Run full backend mutation testing
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if: (github.event_name == 'push' || github.event.inputs.incremental == 'false') && (github.event.inputs.scope != 'frontend')
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run: npm run mutation:test:backend
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continue-on-error: true
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# Manual workflow dispatch
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- name: Run frontend mutation testing (manual)
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if: github.event_name == 'workflow_dispatch' && (github.event.inputs.scope == 'frontend' || github.event.inputs.scope == 'both')
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run: npm run mutation:test:frontend
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continue-on-error: true
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- name: Run backend mutation testing (manual)
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if: github.event_name == 'workflow_dispatch' && (github.event.inputs.scope == 'backend' || github.event.inputs.scope == 'both')
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run: npm run mutation:test:backend
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continue-on-error: true
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- name: Generate mutation reports
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if: always()
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run: npm run mutation:test:report
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continue-on-error: true
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- name: Upload frontend mutation report
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if: always()
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uses: actions/upload-artifact@v4
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with:
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name: mutation-report-frontend-${{ github.sha }}
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path: mutation-reports/frontend/
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retention-days: 30
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- name: Upload backend mutation report
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if: always()
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uses: actions/upload-artifact@v4
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with:
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name: mutation-report-backend-${{ github.sha }}
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path: mutation-reports/backend/
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retention-days: 30
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- name: Upload mutation history
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if: github.ref == 'refs/heads/main'
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uses: actions/upload-artifact@v4
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with:
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name: mutation-history
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path: mutation-reports/mutation-history.json
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retention-days: 90
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- name: Upload mutation summary
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if: always()
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uses: actions/upload-artifact@v4
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with:
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name: mutation-summary-${{ github.sha }}
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path: mutation-reports/mutation-summary.md
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retention-days: 30
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# Post PR comment with results
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- name: Read mutation summary
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if: github.event_name == 'pull_request' && always()
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id: mutation-summary
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run: |
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if [ -f mutation-reports/mutation-summary.md ]; then
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{
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echo 'SUMMARY<<EOF'
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cat mutation-reports/mutation-summary.md
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echo EOF
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} >> "$GITHUB_OUTPUT"
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else
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echo "SUMMARY=Mutation testing report not available." >> "$GITHUB_OUTPUT"
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fi
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- name: Comment PR with mutation results
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if: github.event_name == 'pull_request' && always()
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uses: actions/github-script@v7
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with:
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github-token: ${{ secrets.GITHUB_TOKEN }}
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script: |
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const summary = `${{ steps.mutation-summary.outputs.SUMMARY }}`;
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// Find existing comment
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const { data: comments } = await github.rest.issues.listComments({
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owner: context.repo.owner,
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repo: context.repo.repo,
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issue_number: context.issue.number,
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});
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const botComment = comments.find(comment =>
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comment.user.type === 'Bot' &&
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comment.body.includes('🧬 Mutation Testing Report')
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);
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const commentBody = summary + '\n\n---\n*Updated: ' + new Date().toUTCString() + '*';
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if (botComment) {
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// Update existing comment
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await github.rest.issues.updateComment({
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owner: context.repo.owner,
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repo: context.repo.repo,
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comment_id: botComment.id,
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body: commentBody
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});
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} else {
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// Create new comment
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await github.rest.issues.createComment({
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owner: context.repo.owner,
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repo: context.repo.repo,
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issue_number: context.issue.number,
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body: commentBody
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});
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}
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# Check mutation score threshold
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- name: Check mutation score threshold
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if: always()
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run: |
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if [ -f mutation-reports/mutation-history.json ]; then
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SCORE=$(node -e "
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const history = require('./mutation-reports/mutation-history.json');
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const latest = history[history.length - 1];
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console.log(latest.scores.overall.toFixed(2));
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")
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echo "Mutation Score: $SCORE%"
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THRESHOLD=75
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if (( $(echo "$SCORE < $THRESHOLD" | bc -l) )); then
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echo "❌ Mutation score $SCORE% is below threshold $THRESHOLD%"
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exit 1
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else
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echo "✅ Mutation score $SCORE% meets threshold $THRESHOLD%"
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fi
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else
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echo "⚠️ No mutation history found, skipping threshold check"
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fi
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# Create mutation testing badge
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mutation-badge:
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name: Update Mutation Badge
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runs-on: ubuntu-latest
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needs: mutation-test
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if: github.ref == 'refs/heads/main'
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Download mutation history
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uses: actions/download-artifact@v4
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with:
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name: mutation-history
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path: mutation-reports/
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- name: Create mutation badge
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run: |
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SCORE=$(node -e "
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const history = require('./mutation-reports/mutation-history.json');
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const latest = history[history.length - 1];
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console.log(latest.scores.overall.toFixed(0));
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")
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COLOR="red"
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if [ "$SCORE" -ge 75 ]; then
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COLOR="brightgreen"
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elif [ "$SCORE" -ge 60 ]; then
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COLOR="yellow"
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fi
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curl -s "https://img.shields.io/badge/mutation-${SCORE}%25-${COLOR}" > mutation-badge.svg
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- name: Upload badge
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uses: actions/upload-artifact@v4
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with:
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name: mutation-badge
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path: mutation-badge.svg
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retention-days: 90

‎.gitignore‎

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coverage/
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.nyc_output/
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# Mutation testing
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.stryker-tmp/
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mutation-reports/
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*.mutation-report.json
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*.mutation-report.html
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# VS Code
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.vscode/settings.json
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!.vscode/extensions.json

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