n8n-mcp/docs/testing-checklist.md

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

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
• Setup test database utilities
• Create factory pattern for nodes ✅ COMPLETED
• Create builder pattern for workflows ✅ COMPLETED
• Setup global test utilities
• Configure test environment variables

CI/CD Pipeline

• GitHub Actions for test execution ✅ COMPLETED & VERIFIED
  • Successfully running with Vitest
  • All 68 tests passing in CI
  • Build time: ~1m 37s
• Coverage reporting integration
• Performance benchmark tracking
• Test result artifacts
• 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

Core Services (Priority 1)

• config-validator.ts - 95% coverage
• enhanced-config-validator.ts - 95% coverage
• workflow-validator.ts - 90% coverage
• expression-validator.ts - 90% coverage
• property-filter.ts - 90% coverage
• example-generator.ts - 85% coverage

Parsers (Priority 2)

• node-parser.ts - 90% coverage
• property-extractor.ts - 90% coverage

MCP Layer (Priority 3)

• tools.ts - 90% coverage
• handlers-n8n-manager.ts - 85% coverage
• handlers-workflow-diff.ts - 85% coverage
• tools-documentation.ts - 80% coverage

Database Layer (Priority 4)

• node-repository.ts - 85% coverage
• database-adapter.ts - 85% coverage
• template-repository.ts - 80% coverage

Loaders and Mappers (Priority 5)

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

Week 5-6: Integration Tests

MCP Protocol Tests

• Full MCP server initialization
• Tool invocation flow
• Error handling and recovery
• Concurrent request handling
• Session management

n8n API Integration

• Workflow CRUD operations
• Webhook triggering
• Execution monitoring
• Authentication handling
• Error scenarios

Database Integration

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

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%+
• Core services: 90%+
• MCP tools: 90%+
• Critical paths: 95%+
• New code: 90%+

Performance Requirements

• All unit tests < 10ms
• Integration tests < 1s
• E2E tests < 10s
• Full suite < 5 minutes
• No memory leaks

Code Quality

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

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, 90%+ critical paths
• Performance: All benchmarks within limits
• Reliability: Zero flaky tests
• Speed: CI pipeline < 5 minutes

Team Metrics

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

Resources & Tools

Documentation

• Vitest: https://vitest.dev/
• Testing Library: https://testing-library.com/
• MSW: https://mswjs.io/
• Testcontainers: https://www.testcontainers.com/

Monitoring

• Codecov: https://codecov.io/
• GitHub Actions: https://github.com/features/actions
• Benchmark Action: https://github.com/benchmark-action/github-action-benchmark

Team Resources

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