Testing Infrastructure and Coverage Improvements

Overview

This issue tracks testing and coverage improvements identified during MR #3 (closed) review. These items will be addressed in a new PR to avoid blocking the current feature delivery.

🔴 P0 - Must Fix Before Merge (Blocking)

These critical items will be addressed immediately in a new PR:

• Add comprehensive tests for src/index.ts entry point

  • Test MCP server initialization
  • Test tool registration
  • Test error handling during startup
  • Test stdio communication

• Fix test infrastructure stability and coverage collection errors

  • Resolve coverage collection issues causing inconsistent reports
  • Fix flaky tests in CI environment
  • Ensure coverage reports are accurate and stable

• Increase core module coverage to 50% minimum

  • Current coverage: ~30% for core modules
  • Target: 50% minimum for src/index.ts, src/server.ts, src/core.ts
  • Add unit tests for uncovered critical paths

🟡 P1 - Fix in Next PR (High Priority)

To be addressed after P0 items:

• Optimize regex pattern compilation for performance

  • Cache compiled regex patterns
  • Benchmark current performance
  • Implement lazy compilation where appropriate

• Add tests for large migration files

  • Test files >10MB
  • Test files with 1000+ SQL statements
  • Ensure memory efficiency

• Reduce mock usage in favor of integration tests

  • Replace mocked database tests with testcontainers
  • Use real file system operations where possible
  • Maintain test speed while improving reliability

🟢 P2 - Technical Debt (Future Enhancement)

Long-term improvements:

• Add progress indicators for long operations

  • Implement progress callbacks for multi-file validation
  • Add ETA estimation for long-running tests

• Implement performance benchmarks

  • Create benchmark suite for critical operations
  • Track performance regressions in CI

• Add memory leak detection tests

  • Implement heap snapshot analysis
  • Test for connection leaks
  • Monitor memory usage during extended operations

Related Links

• MR: !3 (merged) (Implement Issue #4 (closed): Idempotency Analysis & Migration Safety Validation)
• Original Issue: #4 (closed)
• Review Comment: MR #3 Review Analysis

Acceptance Criteria

• All P0 items completed and tested
• Coverage reports show ≥50% for core modules
• CI pipeline passing with stable test results
• No regression in existing functionality

Timeline

• P0 Items: Immediate - New PR within 24 hours
• P1 Items: Next sprint
• P2 Items: Backlog for future consideration