feat: Set up comprehensive Python testing infrastructure

[llbbl]

Set up Python Testing Infrastructure

Summary

This PR establishes a comprehensive testing infrastructure for the GEPP project using Poetry as the package manager and pytest as the testing framework.

🔧 Infrastructure Components Added

• Poetry Configuration: Set up pyproject.toml with Poetry as package manager

  • Migrated all dependencies from requirements.txt
  • Added testing dependencies as development group
  • Fixed version compatibility issues between Jinja2 and MarkupSafe

• Testing Framework: Configured pytest with comprehensive settings

  • Custom markers for unit, integration, and slow tests
  • Coverage reporting with 80% threshold requirement
  • HTML and XML coverage report generation
  • Strict configuration for consistent test behavior

• Directory Structure: Created organized testing layout

  tests/
  ├── __init__.py
  ├── conftest.py          # Shared fixtures
  ├── unit/
  │   └── __init__.py
  ├── integration/
  │   └── __init__.py
  └── test_infrastructure.py  # Validation tests
  

• Shared Fixtures: Comprehensive conftest.py with common testing utilities

  • Temporary directory management
  • Mock Docker client and Git repository
  • Sample configurations and requirements
  • Environment variable cleanup

🧪 Testing Commands

Run tests using Poetry:

# Run all tests
poetry run pytest

# Run with coverage
poetry run pytest --cov=. --cov-report=html

# Run specific test categories
poetry run pytest -m unit
poetry run pytest -m integration
poetry run pytest -m slow

✅ Validation

• All 15 infrastructure validation tests pass
• Dependencies successfully installed and compatible
• Coverage reporting generates HTML and XML outputs
• Testing directory structure properly configured
• Fixtures and markers working as expected

📝 Additional Changes

• Updated .gitignore with Claude Code settings (.claude/*)
• All testing-related entries already present in existing .gitignore
• Poetry lock file created but not added to .gitignore as requested

🚀 Ready for Development

The testing infrastructure is now ready for developers to start writing tests. The foundation provides:

• Comprehensive fixture library for common testing scenarios
• Organized structure separating unit and integration tests
• Coverage tracking with reasonable thresholds
• Flexible marker system for test categorization
• Compatible dependency versions

Developers can immediately begin writing tests using the established patterns and fixtures.