SSH MCP Server

# 🛡️ Regression Prevention Test Suite ## Overview The Regression Prevention Test Suite is a comprehensive testing infrastructure designed to protect all achievements of the **Terminal Echo Fix with Villenele Enhancement Epic** from future regressions. This suite implements Story 03 with complete coverage of all acceptance criteria (AC 3.1-3.18). ## 🎯 Purpose This test suite provides **permanent protection** against regression of: - **Terminal Echo Fix**: Prevents command echo duplication in browser terminals - **Command State Synchronization**: Protects browser command tracking and MCP gating functionality - **Enhanced Villenele Framework**: Maintains advanced testing capabilities and cross-platform support ## 🏗️ Architecture ### Zero-Mock Philosophy **CRITICAL**: All tests use real infrastructure: - ✅ Real SSH connections to localhost - ✅ Real WebSocket communications - ✅ Real MCP server integration - ❌ **NO MOCKS** in any regression prevention test ### Test Organization ``` tests/regression-prevention/ ├── comprehensive-echo-regression-detection.test.ts # AC 3.1-3.3 ├── command-state-sync-regression-prevention.test.ts # AC 3.4-3.6 ├── enhanced-villenele-regression-prevention.test.ts # AC 3.7-3.9 ├── ci-cd-integration.test.ts # AC 3.10-3.12 ├── test-suite-maintenance.test.ts # AC 3.13-3.15 ├── documentation-and-team-integration.test.ts # AC 3.16-3.18 ├── regression-prevention-suite.test.ts # Complete orchestration └── README.md # This documentation ``` ## 📋 Acceptance Criteria Coverage ### AC 3.1-3.3: Comprehensive Echo Regression Detection - **AC 3.1**: Echo duplication detection across all command types - **AC 3.2**: Cross-command-type validation with CI/CD build failure on regression - **AC 3.3**: Protocol-specific detection for browser vs MCP command paths ### AC 3.4-3.6: Command State Synchronization Protection - **AC 3.4**: Browser command tracking regression detection - **AC 3.5**: MCP command gating validation with BROWSER_COMMANDS_EXECUTED errors - **AC 3.6**: Command cancellation functionality preservation ### AC 3.7-3.9: Enhanced Villenele Capabilities Protection - **AC 3.7**: Enhanced parameter structure `{initiator, command, cancel?, waitToCancelMs?}` - **AC 3.8**: Dual-channel command execution (browser vs MCP routing) - **AC 3.9**: Dynamic expected value construction with environment variables ### AC 3.10-3.12: Automated CI/CD Integration - **AC 3.10**: Pipeline integration for commits, PRs, nightly builds, releases - **AC 3.11**: Performance optimization (<15 minute execution time) - **AC 3.12**: Regression detection alerts with deployment blocking ### AC 3.13-3.15: Test Suite Maintenance - **AC 3.13**: Evolution and expansion capabilities - **AC 3.14**: Quality assurance with deliberate regression injection - **AC 3.15**: Performance regression detection integration ### AC 3.16-3.18: Documentation and Team Integration - **AC 3.16**: Comprehensive documentation and onboarding guides - **AC 3.17**: Development workflow integration with rapid feedback - **AC 3.18**: Long-term sustainability framework ## 🚀 Quick Start ### Prerequisites - Node.js 18+ installed - SSH service running on localhost - SSH key configured at `~/.ssh/id_ed25519` - Project dependencies installed (`npm install`) ### Basic Usage ```bash # Run complete regression prevention suite npm test -- --testPathPattern="regression-prevention" # Run specific test category npm test -- --testNamePattern="Echo Regression Detection" # Run with verbose output for debugging npm test -- --testPathPattern="regression-prevention" --verbose # Quick regression check (< 5 minutes) npm test -- --testNamePattern="Quick Regression Check" ``` ### Local Development Workflow ```bash # Before starting development npm test -- --testPathPattern="regression-prevention" --bail # During development (quick checks) npm test -- --testNamePattern="relevant functionality area" # Before committing npm test -- --testPathPattern="regression-prevention" # Pre-push validation npm test -- --testNamePattern="Final.*Comprehensive.*Protection" ``` ## 🔧 Configuration ### SSH Setup for Testing ```bash # Generate SSH key if not exists ssh-keygen -t ed25519 -f ~/.ssh/id_ed25519 -N "" # Add to authorized keys for localhost access cat ~/.ssh/id_ed25519.pub >> ~/.ssh/authorized_keys chmod 600 ~/.ssh/authorized_keys chmod 700 ~/.ssh # Start SSH service sudo service ssh start # Test connectivity ssh -o StrictHostKeyChecking=no localhost echo "SSH test successful" ``` ### Environment Variables - `USER`: Used for dynamic expected value construction - `PWD`: Used for cross-environment test execution - `CI`: Enables CI-specific optimizations when set ## 📊 Performance Targets - **Individual Test**: < 60 seconds - **Test Category**: < 5 minutes - **Complete Suite**: < 15 minutes - **Quick Check**: < 30 seconds - **CI/CD Pipeline**: < 10 minutes ## 🚨 Failure Scenarios & Resolution ### Echo Duplication Regression **Symptom**: Commands appearing multiple times in terminal output ``` 🚨 REGRESSION DETECTED: Command "pwd" appears 2 times instead of once ``` **Cause**: WebSocket terminal_input handler duplicating echo **Resolution**: Review `src/web-server-manager.ts` echo handling logic ### Command State Sync Failure **Symptom**: MCP commands executing when should be gated ``` 🚨 MCP command executed when browser commands in buffer ``` **Cause**: Browser command tracking or gating logic failure **Resolution**: Validate Command State Synchronization implementation ### Enhanced Villenele Regression **Symptom**: Parameter structure or dual-channel execution failure ``` 🚨 Enhanced parameter structure not accepted ``` **Cause**: Changes to Villenele framework parameter handling **Resolution**: Restore enhanced parameter structure support ## 🔄 CI/CD Integration ### Automated Execution - **Every Commit**: Quick regression check (< 5 minutes) - **Pull Requests**: Comprehensive validation (< 15 minutes) - **Nightly Builds**: Full suite with performance analysis (< 25 minutes) - **Releases**: Complete validation with deployment gating (< 30 minutes) ### Deployment Blocking Any regression detection **automatically blocks deployment** until: 1. Regression is identified and fixed 2. All regression tests pass 3. Manual validation confirms fix effectiveness ## 📈 Monitoring & Alerts ### Automated Alerts - **Slack/Email**: Immediate notification on regression detection - **Dashboard**: Real-time test execution status - **Metrics**: Performance trends and regression patterns ### Historical Analysis - **Trend Tracking**: Performance and reliability over time - **Regression Patterns**: Identify recurring regression types - **Coverage Evolution**: Test suite expansion and effectiveness ## 👥 Team Integration ### Developer Responsibilities - **Before Coding**: Run baseline regression tests - **During Development**: Quick checks for modified areas - **Before Commit**: Complete regression validation - **Code Review**: Verify regression test coverage ### Maintenance Schedule - **Daily**: Monitor CI/CD execution results - **Weekly**: Review performance metrics and coverage - **Monthly**: Comprehensive test suite assessment - **Quarterly**: Architecture review and evolution planning ## 🧪 Adding New Regression Tests ### 1. Identify Regression Risk Analyze new functionality for potential regression impact: ```typescript // Example: New WebSocket handling feature // Risk: Could affect echo behavior // Required: Add echo regression test ``` ### 2. Follow Established Patterns ```typescript describe('AC X.Y: New Regression Protection', () => { let testUtils: JestTestUtilities; beforeEach(async () => { testUtils = new JestTestUtilities({ enableDetailedLogging: true, enableErrorDiagnostics: true, testTimeout: 60000 }); await testUtils.setupTest('new-regression-test'); }); test('should detect specific regression scenario', async () => { const sessionName = 'regression-test-session'; const testConfig = { preWebSocketCommands: [ `ssh_connect {"name": "${sessionName}", "host": "localhost", "username": "jsbattig", "keyFilePath": "/home/jsbattig/.ssh/id_ed25519"}` ], postWebSocketCommands: [ { initiator: 'browser' as const, command: 'test-command' } ], workflowTimeout: 60000, sessionName }; const result = await testUtils.runTerminalHistoryTest(testConfig); // Regression-specific assertions expect(result.concatenatedResponses).toContain('expected-behavior'); await testUtils.disconnectSession(sessionName); }); }); ``` ### 3. Validation Requirements - ✅ Test detects regression when present - ✅ Test passes when regression not present - ✅ Clear failure messages with resolution guidance - ✅ Performance within acceptable limits - ✅ Integration with CI/CD pipeline ## 🎯 Success Metrics ### Regression Detection - **Detection Rate**: >95% of known regression scenarios caught - **False Positives**: <5% to maintain developer confidence - **Mean Time to Detection**: <10 minutes in CI/CD pipeline ### Developer Experience - **Execution Time**: Within performance targets - **Failure Clarity**: Clear guidance for resolution - **Maintenance Effort**: <20% of development time ### Business Value - **Production Incidents**: Prevented through early detection - **Release Confidence**: High confidence in deployment safety - **Customer Satisfaction**: Maintained terminal display quality ## 🔮 Future Evolution ### Planned Enhancements - **AI-Powered Regression Detection**: Machine learning for pattern recognition - **Visual Regression Testing**: Browser terminal display validation - **Performance Benchmarking**: Automated performance regression detection - **Cross-Platform Expansion**: Windows and macOS test execution ### Sustainability Framework - **Automated Maintenance**: Self-updating test configurations - **Intelligent Test Selection**: Run only relevant tests based on changes - **Continuous Optimization**: Performance and coverage improvements - **Knowledge Preservation**: Automated documentation updates ## 🆘 Support & Troubleshooting ### Common Issues **SSH Connection Failures** ```bash # Check SSH service sudo service ssh status # Verify key permissions chmod 600 ~/.ssh/id_ed25519 chmod 700 ~/.ssh # Test connectivity ssh -o StrictHostKeyChecking=no localhost echo "test" ``` **MCP Server Issues** ```bash # Check MCP server dependencies npm list | grep mcp # Verify port availability netstat -tlnp | grep :8080 # Test MCP connectivity curl http://localhost:8080/health ``` **Test Timeouts** - Increase timeout values for slower environments - Check system resource availability - Verify network connectivity to localhost ### Getting Help 1. **Check Logs**: Review test execution logs for specific errors 2. **Troubleshooting Guide**: Follow AC 3.16 comprehensive guide 3. **Team Escalation**: Contact development team lead 4. **Documentation**: Review this README and inline documentation --- ## 📚 Additional Resources - **Epic Documentation**: `/plans/backlog/TerminalEchoFixWithVillenele/` - **Villenele Framework**: `/tests/integration/terminal-history-framework/` - **CI/CD Configuration**: `/.github/workflows/regression-prevention.yml` - **Team Guidelines**: Project CLAUDE.md **Remember**: This test suite is our insurance policy against regression. Every test represents a real problem that occurred and was fixed. Maintaining this suite protects all team members and users from experiencing these issues again.