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n8n-mcp/docs/testing-checklist.md
czlonkowski 7f8a3de776 fix: resolve MCP protocol test failures by fixing response format expectations 
- Fixed test-helpers.ts to correctly wrap executeTool responses in MCP format
- Updated all tests to expect correct response structures:
  - list_nodes returns {nodes: [...], totalCount}
  - search_nodes returns {query, results: [...], totalCount, mode?}
  - list_ai_tools returns {tools: [...]}
  - list_tasks returns {totalTasks, categories: {...}} or {category, tasks: [...]}
- Fixed property expectations (nodeType instead of name, etc.)
- Reduced failing tests from 67 to 7

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-07-29 18:55:20 +02:00

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n8n-MCP Testing Implementation Checklist

Immediate Actions (Day 1)

  • Fix failing tests (Phase 0) ✅ COMPLETED
  • Create GitHub Actions workflow file ✅ COMPLETED
  • Install Vitest and remove Jest ✅ COMPLETED
  • Create vitest.config.ts ✅ COMPLETED
  • Setup global test configuration ✅ COMPLETED
  • Migrate existing tests to Vitest syntax ✅ COMPLETED
  • Setup coverage reporting with Codecov ✅ COMPLETED

Phase 1: Vitest Migration ✅ COMPLETED

All tests have been successfully migrated from Jest to Vitest:

  • ✅ Removed Jest and installed Vitest
  • ✅ Created vitest.config.ts with path aliases
  • ✅ Set up global test configuration
  • ✅ Migrated all 6 test files (68 tests passing)
  • ✅ Updated TypeScript configuration
  • ✅ Cleaned up Jest configuration files

Week 1: Foundation

Testing Infrastructure ✅ COMPLETED (Phase 2)

  • Create test directory structure ✅ COMPLETED
  • Setup mock infrastructure for better-sqlite3 ✅ COMPLETED
  • Create mock for n8n-nodes-base package ✅ COMPLETED
  • Setup test database utilities ✅ COMPLETED
  • Create factory pattern for nodes ✅ COMPLETED
  • Create builder pattern for workflows ✅ COMPLETED
  • Setup global test utilities ✅ COMPLETED
  • Configure test environment variables ✅ COMPLETED

CI/CD Pipeline ✅ COMPLETED (Phase 3.8)

  • GitHub Actions for test execution ✅ COMPLETED & VERIFIED
    • Successfully running with Vitest
    • 1021 tests passing in CI
    • Build time: ~2 minutes
  • Coverage reporting integration ✅ COMPLETED (Codecov setup)
  • Performance benchmark tracking ✅ COMPLETED
  • Test result artifacts ✅ COMPLETED
  • Branch protection rules
  • Required status checks

Week 2: Mock Infrastructure

Database Mocking

  • Complete better-sqlite3 mock implementation
  • Mock prepared statements
  • Mock transactions
  • Mock FTS5 search functionality
  • Test data seeding utilities

External Dependencies

  • Mock axios for API calls
  • Mock file system operations
  • Mock MCP SDK
  • Mock Express server
  • Mock WebSocket connections

Week 3-4: Unit Tests ✅ COMPLETED (Phase 3)

Core Services (Priority 1) ✅ COMPLETED

  • config-validator.ts - 95% coverage ✅ 96.9%
  • enhanced-config-validator.ts - 95% coverage ✅ 94.55%
  • workflow-validator.ts - 90% coverage ✅ 97.59%
  • expression-validator.ts - 90% coverage ✅ 97.22%
  • property-filter.ts - 90% coverage ✅ 95.25%
  • example-generator.ts - 85% coverage ✅ 94.34%

Parsers (Priority 2) ✅ COMPLETED

  • node-parser.ts - 90% coverage ✅ 97.42%
  • property-extractor.ts - 90% coverage ✅ 95.49%

MCP Layer (Priority 3) ✅ COMPLETED

  • tools.ts - 90% coverage ✅ 94.11%
  • handlers-n8n-manager.ts - 85% coverage ✅ 92.71%
  • handlers-workflow-diff.ts - 85% coverage ✅ 96.34%
  • tools-documentation.ts - 80% coverage ✅ 94.12%

Database Layer (Priority 4) ✅ COMPLETED

  • node-repository.ts - 85% coverage ✅ 91.48%
  • database-adapter.ts - 85% coverage ✅ 89.29%
  • template-repository.ts - 80% coverage ✅ 86.78%

Loaders and Mappers (Priority 5) ✅ COMPLETED

  • node-loader.ts - 85% coverage ✅ 91.89%
  • docs-mapper.ts - 80% coverage ✅ 95.45%

Additional Critical Services Tested ✅ COMPLETED (Phase 3.5)

  • n8n-api-client.ts ✅ 83.87%
  • workflow-diff-engine.ts ✅ 90.06%
  • n8n-validation.ts ✅ 97.14%
  • node-specific-validators.ts ✅ 98.7%

Week 5-6: Integration Tests 🚧 IN PROGRESS

MCP Protocol Tests ✅ PARTIALLY COMPLETED

  • Full MCP server initialization ✅ COMPLETED
  • Tool invocation flow ⚠️ FAILING (response structure issues)
  • Error handling and recovery ✅ COMPLETED
  • Concurrent request handling ✅ COMPLETED
  • Session management ✅ COMPLETED

n8n API Integration 🔄 PENDING

  • Workflow CRUD operations (MSW mocks ready)
  • Webhook triggering
  • Execution monitoring
  • Authentication handling
  • Error scenarios

Database Integration ✅ COMPLETED

  • SQLite operations with real DB ✅ COMPLETED
  • FTS5 search functionality ✅ COMPLETED
  • Transaction handling ✅ COMPLETED
  • Migration testing
  • Performance under load ✅ COMPLETED

Week 7-8: E2E & Performance

End-to-End Scenarios

  • Complete workflow creation flow
  • AI agent workflow setup
  • Template import and validation
  • Workflow execution monitoring
  • Error recovery scenarios

Performance Benchmarks

  • Node loading speed (< 50ms per node)
  • Search performance (< 100ms for 1000 nodes)
  • Validation speed (< 10ms simple, < 100ms complex)
  • Database query performance
  • Memory usage profiling
  • Concurrent request handling

Load Testing

  • 100 concurrent MCP requests
  • 10,000 nodes in database
  • 1,000 workflow validations/minute
  • Memory leak detection
  • Resource cleanup verification

Testing Quality Gates

Coverage Requirements

  • Overall: 80%+ (Currently: 62.67%)
  • Core services: 90%+ ✅ COMPLETED
  • MCP tools: 90%+ ✅ COMPLETED
  • Critical paths: 95%+ ✅ COMPLETED
  • New code: 90%+ ✅ COMPLETED

Performance Requirements

  • All unit tests < 10ms ✅ COMPLETED
  • Integration tests < 1s
  • E2E tests < 10s
  • Full suite < 5 minutes ✅ COMPLETED (~2 minutes)
  • No memory leaks ✅ COMPLETED

Code Quality

  • No ESLint errors ✅ COMPLETED
  • No TypeScript errors ✅ COMPLETED
  • No console.log in tests ✅ COMPLETED
  • All tests have descriptions ✅ COMPLETED
  • No hardcoded values ✅ COMPLETED

Monitoring & Maintenance

Daily

  • Check CI pipeline status
  • Review failed tests
  • Monitor flaky tests

Weekly

  • Review coverage reports
  • Update test documentation
  • Performance benchmark review
  • Team sync on testing progress

Monthly

  • Update baseline benchmarks
  • Review and refactor tests
  • Update testing strategy
  • Training/knowledge sharing

Risk Mitigation

Technical Risks

  • Mock complexity - Use simple, maintainable mocks
  • Test brittleness - Focus on behavior, not implementation
  • Performance impact - Run heavy tests in parallel
  • Flaky tests - Proper async handling and isolation

Process Risks

  • Slow adoption - Provide training and examples
  • Coverage gaming - Review test quality, not just numbers
  • Maintenance burden - Automate what's possible
  • Integration complexity - Use test containers

Success Criteria

Technical Metrics

  • Coverage: 80%+ overall (62.67% - needs improvement), 90%+ critical paths ✅
  • Performance: All benchmarks within limits ✅
  • Reliability: Zero flaky tests ✅ (1 skipped)
  • Speed: CI pipeline < 5 minutes ✅ (~2 minutes)

Team Metrics

  • All developers writing tests ✅
  • Tests reviewed in PRs ✅
  • No production bugs from tested code
  • Improved development velocity ✅

Phases Completed

  • Phase 0: Immediate Fixes ✅ COMPLETED
  • Phase 1: Vitest Migration ✅ COMPLETED
  • Phase 2: Test Infrastructure ✅ COMPLETED
  • Phase 3: Unit Tests (All 943 tests) ✅ COMPLETED
  • Phase 3.5: Critical Service Testing ✅ COMPLETED
  • Phase 3.8: CI/CD & Infrastructure ✅ COMPLETED
  • Phase 4: Integration Tests 🚧 IN PROGRESS
    • Database Integration: ✅ COMPLETED
    • MCP Protocol Tests: ⚠️ FAILING (67/255 tests failing with response structure issues)
    • n8n API Integration: 🔄 PENDING (MSW infrastructure ready)
    • Key Issues: Integration tests failing due to response structure mismatch in callTool responses
    • Next Steps: Fix response structure issues in MCP protocol tests
  • Phase 5: E2E Tests 🔄 PENDING

Resources & Tools

Documentation

Monitoring

Team Resources

  • Testing best practices guide
  • Example test implementations
  • Mock usage patterns
  • Performance optimization tips