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Code Coverage Report

Summary

Current test coverage for the mcpmon project as of latest run:

Overall Coverage Metrics

=============================== Coverage summary ===============================
Statements   : 58.96% ( 332/563 )
Branches     : 36.62% ( 63/172 )
Functions    : 58.49% ( 62/106 )
Lines        : 59.96% ( 325/542 )
================================================================================

Test Statistics

  • Total Test Suites: 8
  • Total Tests: 65 (all passing)
  • Test Categories:
    • Behavioral tests: 27 tests
    • Integration tests: 30 tests
    • Error scenario tests: 8 tests

Coverage by Component

Well-Tested Components (>60% coverage)

  1. proxy.ts - Core proxy implementation

    • ~62% line coverage
    • Message buffering, restart logic, file watching
    • Process lifecycle management

  2. CLI Integration - Command-line interface

    • Comprehensive integration tests
    • Auto-detection for Node.js, Python, Deno
    • Environment variable handling
    • Error scenarios

  3. Node Implementations - Platform-specific code

    • NodeFileSystem: File operations and watching
    • NodeProcessManager: Process spawning and management
    • Spawn error handling via status promise

Partially Tested Components (30-60% coverage)

  1. Error Handling Paths

    • Server initialization failures ✓
    • Process crash recovery ✓
    • Stream forwarding errors ✓
    • Request timeouts ✓

  2. Configuration

    • Basic configuration handling
    • Environment variable processing

Low Coverage Components (<30% coverage)

  1. cli.ts - Main CLI entry point (0%)

    • Tested indirectly through integration tests
    • Direct unit tests would improve coverage

  2. index.ts - Library exports (0%)

    • Simple export file
    • Used by library consumers

  3. interfaces.ts - Type definitions (0%)

    • Pure TypeScript interfaces
    • Dead code removed (isProcessManager, isFileSystem)

Test Categories

Behavioral Tests (tests/behavior/)

  • proxy_restart.test.ts - File change triggers restart
  • message_buffering.test.ts - Messages queued during restart
  • initialization_replay.test.ts - Initialize params preserved
  • error_handling.test.ts - Various error scenarios
  • error_scenarios.test.ts - Additional error paths
  • generic_interfaces.test.ts - Interface compatibility

Integration Tests (tests/integration/)

  • cli.test.ts - Full CLI functionality
    • Help display
    • Watch file auto-detection
    • Environment variables
    • Process management
    • Signal handling
  • node_implementations.test.ts - Real file I/O and process operations
    • File watching with multiple files
    • Process spawning with various configurations
    • Stream handling
    • Error propagation

Recent Improvements

  1. Fixed all test failures - All 65 tests now pass reliably
  2. Added comprehensive error scenario tests - Improved error path coverage
  3. Fixed timer cleanup - Resolved Jest worker exit warnings
  4. Fixed spawn error handling - Async errors now properly propagated
  5. Added CLI integration tests - Real-world usage scenarios
  6. Added Node implementation tests - Platform-specific functionality

Recommendations for Further Improvement

  1. Add unit tests for cli.ts - Would significantly boost coverage
  2. Test edge cases:
    • Very large files/directories
    • Symbolic links
    • Permission errors
    • Network file systems
  3. Performance tests:
    • Stress testing with many file changes
    • Memory usage over time
    • Large message handling
  4. Cross-platform testing:
    • Windows-specific path handling
    • Different Node.js versions

Strengths

✅ Comprehensive behavioral testing - Core functionality thoroughly tested ✅ Real integration tests - Actual process spawning and file I/O ✅ Error scenario coverage - Many error paths now tested ✅ Clean test architecture - Good use of mocks and helpers ✅ Deterministic timing - No flaky setTimeout-based tests