feat: Set up comprehensive Python testing infrastructure

[llbbl]

Python Testing Infrastructure Setup

Summary

This PR sets up a comprehensive testing infrastructure for the Python video converter project, providing a complete testing environment ready for development.

Changes Made

🔧 Package Management

• Added Poetry as the package manager with pyproject.toml configuration
• Migrated all dependencies from requirements.txt to Poetry format
• Preserved exact version pins for production dependencies
• Added development/test dependencies in separate Poetry group

🧪 Testing Framework

• Configured pytest as the main testing framework
• Added testing dependencies:
  • pytest - Main testing framework
  • pytest-cov - Coverage reporting with 80% threshold
  • pytest-mock - Advanced mocking utilities
• Custom pytest markers: @pytest.mark.unit, @pytest.mark.integration, @pytest.mark.slow

📊 Coverage Reporting

• HTML reports generated in htmlcov/ directory
• XML reports for CI/CD integration (coverage.xml)
• Terminal output with missing line indicators
• 80% coverage threshold enforcement
• Source filtering to focus on video_converter/ package

📁 Directory Structure

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

🛠️ Fixtures & Utilities

• conftest.py with comprehensive shared fixtures:
  • temp_dir - Temporary directory management
  • sample_audio_file / sample_video_file - Mock file creation
  • mock_logger - Logger mocking
  • mock_config - Configuration mocking
  • mock_pydub_audio - Audio processing mocks
  • mock_speech_recognition - Speech recognition mocks

📋 Configuration

• pytest configuration in pyproject.toml with:
  • Test discovery patterns
  • Coverage settings and thresholds
  • Output formatting options
  • Strict marker and config validation
• Coverage exclusions for test files, cache, and common patterns

🗂️ Maintenance

• Updated .gitignore with:
  • Testing artifacts (.pytest_cache/, .coverage, htmlcov/)
  • Claude Code settings (.claude/)
  • Build artifacts and environment files
• Validation tests to ensure infrastructure works correctly

Running Tests

# Run all tests with coverage
poetry run pytest

# Run only unit tests
poetry run pytest -m unit

# Run only integration tests  
poetry run pytest -m integration

# Run without coverage
poetry run pytest --no-cov

# Run specific test file
poetry run pytest tests/test_setup_validation.py

# Run with verbose output
poetry run pytest -v

Validation

✅ All validation tests passing (10/10)
✅ Coverage reporting working (HTML, XML, terminal)
✅ Poetry dependency installation successful
✅ Test markers functioning correctly
✅ Fixture system operational
✅ Directory structure created

Next Steps

The testing infrastructure is now ready for development. Developers can:

1. Start writing unit tests in tests/unit/
2. Add integration tests in tests/integration/
3. Use provided fixtures from conftest.py
4. Run tests locally with poetry run pytest
5. Monitor coverage to maintain 80% threshold

Notes

• Poetry lock file included but not in .gitignore as requested
• Exact dependency versions preserved from original requirements.txt
• Testing dependencies isolated in development group
• No actual unit tests written - only infrastructure and validation setup
• Coverage threshold set to 80% - will fail until actual tests are written

🤖 Generated with Claude Code