MCP WordPress Server

# Test Coverage Strategy ## Overview This document defines the comprehensive test coverage strategy for the MCP WordPress project, establishing clear scope, thresholds, and implementation phases to ensure code quality and reliability. ## Current Baseline (As of 2025-08-09) Based on recent coverage analysis: | Metric | Current | Target (Phase 1) | Target (Phase 2) | Target (Phase 3) | | -------------- | ------- | ---------------- | ---------------- | ---------------- | | **Lines** | 31.07% | 40% | 55% | 70% | | **Branches** | 24.07% | 30% | 45% | 65% | | **Functions** | 27.69% | 35% | 50% | 70% | | **Statements** | 29.85% | 38% | 53% | 68% | ## Coverage Scope ### Included in Coverage #### Core Application Code - **src/client/**: WordPress API client and authentication (Priority: High) - **src/tools/**: All 59 MCP tools across 10 categories (Priority: High) - **src/server/**: MCP server implementation and tool registry (Priority: High) - **src/utils/**: Validation, error handling, streaming utilities (Priority: Medium) - **src/config/**: Configuration management and validation (Priority: Medium) - **src/cache/**: Cache management and invalidation (Priority: Medium) - **src/performance/**: Metrics collection and monitoring (Priority: Low) - **src/security/**: Security configuration and policies (Priority: Medium) ### Excluded from Coverage #### Generated/External Code - **dist/**: Compiled JavaScript output (auto-generated from TypeScript) - **node_modules/**: External dependencies - **coverage/**: Coverage report artifacts - **docs/**: Documentation files #### Test Infrastructure - **tests/**: Test files themselves - **\*.test.js**: Test implementation files - **jest.\*.js**: Jest configuration files #### Development Tools - **scripts/**: Build, deployment, and utility scripts - **.github/**: CI/CD workflow definitions - **docs/**: API documentation (auto-generated) ## Implementation Phases ### Phase 1: Foundation (Target: 40% lines, 30% branches) **Timeline**: 2-3 weeks **Focus**: Critical path coverage and infrastructure #### High-Priority Components 1. **Validation utilities** (`src/utils/validation.ts`) - **Currently: 82.91%** ✅ 2. **Error handling** (`src/utils/error.ts`) - **Currently: 100%** ✅ 3. **Tool wrappers** (`src/utils/toolWrapper.ts`) - **Currently: 78.12%** ✅ 4. **Cache tools** (`src/tools/cache.ts`) - **Currently: 95%** ✅ 5. **Configuration schema** (`src/config/ConfigurationSchema.ts`) - **Currently: 71.92%** ✅ #### Medium-Priority Components 1. **WordPress API client** (`src/client/api.ts`) - Currently: 35.02% 2. **Server configuration** (`src/config/ServerConfiguration.ts`) - Currently: 38.27% 3. **Site tools** (`src/tools/site.ts`) - Currently: 59.01% 4. **Connection tester** (`src/server/ConnectionTester.ts`) - Currently: 47.82% #### Implementation Tasks - [ ] Improve WordPress API client test coverage (+15%) - [ ] Add comprehensive server configuration tests (+20%) - [ ] Enhance connection testing coverage (+15%) - [ ] Add missing edge case tests for site tools (+10%) ### Phase 2: Core Functionality (Target: 55% lines, 45% branches) **Timeline**: 3-4 weeks **Focus**: Business logic and tool implementations #### Target Components 1. **All MCP tools** (`src/tools/`) - Currently: 11.71% (Major improvement needed) - Posts tools: 0.62% → 60% - Pages tools: 2.85% → 60% - Media tools: 3.44% → 60% - Users tools: 1.61% → 60% - Comments tools: 2.85% → 60% - Taxonomies tools: 1.96% → 60% 2. **Tool registry** (`src/server/ToolRegistry.ts`) - 39.13% → 65% 3. **Cache management** (`src/cache/CacheManager.ts`) - 46.61% → 70% #### Implementation Tasks - [ ] Add comprehensive tool testing framework - [ ] Implement mock WordPress responses for all tools - [ ] Add integration tests for tool registry - [ ] Enhance cache management test coverage ### Phase 3: Advanced Features (Target: 70% lines, 65% branches) **Timeline**: 4-5 weeks **Focus**: Advanced features and edge cases #### Target Components 1. **Performance monitoring** (`src/performance/`) - Currently: 41.97% → 75% 2. **Authentication system** (`src/client/auth.ts`) - Currently: 0% → 70% 3. **Cache invalidation** (`src/cache/CacheInvalidation.ts`) - Currently: 42.85% → 75% 4. **Advanced client features** (`src/client/CachedWordPressClient.ts`) - Currently: 5.61% → 70% ## Coverage Thresholds and Enforcement ### Jest Configuration Thresholds #### Phase 1 Thresholds (Immediate) ```javascript coverageThreshold: { global: { branches: 30, functions: 35, lines: 40, statements: 38 } } ``` #### Component-Specific Thresholds ```javascript coverageThreshold: { // Critical components - higher standards 'src/utils/validation.ts': { branches: 80, functions: 90, lines: 85, statements: 85 }, 'src/utils/error.ts': { branches: 100, functions: 100, lines: 100, statements: 100 }, // Core business logic - medium standards 'src/client/api.ts': { branches: 50, functions: 60, lines: 55, statements: 55 }, 'src/tools/': { branches: 40, functions: 50, lines: 45, statements: 45 }, // Advanced features - baseline standards 'src/performance/': { branches: 30, functions: 40, lines: 35, statements: 35 } } ``` ### Enforcement Strategy #### Pre-commit Hooks - Run coverage check before commits - Block commits that reduce coverage below thresholds - Allow temporary threshold bypasses with `--skip-coverage` flag for urgent fixes #### CI/CD Integration - Generate coverage reports on every PR - Post coverage diff comments on PRs - Block merges that significantly reduce coverage (>2% regression) - Publish coverage badges automatically #### Coverage Guardrails - Existing `scripts/coverage-guardrail.js` enhanced with: - Component-specific threshold validation - Trend analysis and regression detection - Actionable recommendations for improvement ## Testing Infrastructure Improvements ### Enhanced Jest Configuration #### Coverage Collection ```javascript collectCoverageFrom: [ 'src/**/*.ts', '!src/**/*.d.ts', '!src/**/__mocks__/**', '!src/**/*.test.ts' ], coverageReporters: [ 'text-summary', // Console output 'lcov', // For external tools 'html', // Human-readable reports 'json', // Machine-readable data 'cobertura' // CI/CD integration ] ``` #### Coverage Exclusions (Justified) ```javascript coveragePathIgnorePatterns: [ "/node_modules/", "/dist/", "/tests/", "/docs/", "src/types/", // Type definitions only "src/.*\\.d\\.ts$", // TypeScript declaration files "src/.*/index.ts$", // Re-export files only ]; ``` ### Testing Frameworks and Tools #### Unit Testing - **Jest**: Primary test runner with comprehensive coverage - **TypeScript**: Full type checking in tests - **Mock Framework**: Enhanced WordPress API mocking #### Integration Testing - **Contract Testing**: Pact.js for API contract verification - **Database Testing**: In-memory WordPress simulation - **Authentication Testing**: All 4 auth methods covered #### Property-Based Testing - **fast-check**: Already implemented for validation functions - **Expanded coverage**: WordPress data structure testing - **Edge case discovery**: Automated boundary testing ## Quality Gates and Reporting ### Coverage Reports #### Automated Generation - **HTML Reports**: Detailed line-by-line coverage for developers - **JSON Reports**: Machine-readable data for tooling integration - **Badge Generation**: Real-time coverage badges for README - **Trend Analysis**: Historical coverage tracking #### Report Distribution - **PR Comments**: Coverage diff for every pull request - **Slack Integration**: Daily coverage summaries - **Email Alerts**: Significant coverage regressions - **Dashboard**: Real-time coverage monitoring ### Quality Metrics #### Primary Metrics - **Line Coverage**: Percentage of executable lines tested - **Branch Coverage**: Percentage of code branches tested - **Function Coverage**: Percentage of functions called in tests - **Statement Coverage**: Percentage of statements executed #### Secondary Metrics - **Complexity Coverage**: Cyclomatic complexity analysis - **Mutation Testing**: Code quality via mutation testing - **Performance Coverage**: Performance-critical paths tested - **Security Coverage**: Security-sensitive code paths tested ## Implementation Timeline ### Week 1-2: Infrastructure - [ ] Update Jest configuration with new thresholds - [ ] Enhance coverage guardrail script - [ ] Set up component-specific thresholds - [ ] Implement coverage trend tracking ### Week 3-4: Foundation Phase - [ ] Improve WordPress API client coverage - [ ] Add server configuration tests - [ ] Enhance connection testing - [ ] Achieve 40% line coverage ### Week 5-8: Core Functionality Phase - [ ] Implement comprehensive tool testing - [ ] Add mock WordPress response framework - [ ] Enhance cache management tests - [ ] Achieve 55% line coverage ### Week 9-12: Advanced Features Phase - [ ] Add performance monitoring tests - [ ] Implement authentication system tests - [ ] Add cache invalidation tests - [ ] Achieve 70% line coverage ## Success Metrics ### Quantitative Goals - **Coverage Increase**: 31% → 70% lines over 12 weeks - **Zero Regressions**: No PRs merged with >2% coverage decrease - **CI/CD Integration**: 100% automated coverage reporting - **Documentation**: 100% of coverage strategy documented ### Qualitative Goals - **Developer Confidence**: Increased confidence in refactoring - **Bug Reduction**: Measurable decrease in production issues - **Code Quality**: Improved maintainability scores - **Team Adoption**: 100% team adoption of coverage practices ## Maintenance and Evolution ### Regular Reviews - **Monthly**: Coverage trend analysis and threshold adjustments - **Quarterly**: Strategy effectiveness review and updates - **Yearly**: Complete strategy overhaul based on project evolution ### Threshold Evolution - **Progressive**: Gradually increase thresholds as coverage improves - **Component-based**: Different standards for different component types - **Risk-adjusted**: Higher thresholds for critical/security-sensitive code ### Tool Evolution - **Technology Updates**: Keep testing tools and frameworks current - **Process Improvements**: Continuously optimize testing workflows - **Team Training**: Regular coverage strategy training and updates ## Conclusion This coverage strategy provides a structured, phased approach to achieving comprehensive test coverage while maintaining development velocity. The focus on critical components first ensures maximum impact, while the graduated threshold approach makes the goals achievable and sustainable. Success depends on team commitment, automated enforcement, and regular strategy evolution based on project needs and industry best practices.