feat: Set up complete Python testing infrastructure with Poetry

[llbbl]

Set up Complete Python Testing Infrastructure with Poetry

Summary

This PR establishes a comprehensive testing infrastructure for the Python project, migrating from a basic requirements.txt setup to a modern Poetry-managed environment with robust testing capabilities.

Changes Made

Package Management

• Migrated to Poetry: Created pyproject.toml with Poetry configuration
• Dependency Migration: Moved dependencies from requirements.txt to Poetry format
• Updated OpenCV: Upgraded opencv-python to ^4.8.0 for better compatibility

Testing Dependencies Added

• pytest ^7.0.0 - Main testing framework
• pytest-cov ^4.0.0 - Coverage reporting
• pytest-mock ^3.10.0 - Mocking utilities

Testing Configuration

• pytest Configuration: Comprehensive setup in pyproject.toml with:
  • 80% coverage threshold requirement
  • HTML and XML coverage report generation
  • Custom markers: unit, integration, slow
  • Strict configuration and output formatting
• Coverage Configuration: Detailed coverage settings with source inclusion/exclusion rules

Directory Structure

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

Shared Testing Fixtures

Created comprehensive fixtures in tests/conftest.py:

• temp_dir, temp_file - Temporary filesystem resources
• sample_data - Common test data structures
• mock_config, mock_database, mock_logger - Mock objects
• json_file, text_file - Temporary files with content
• mock_environment - Environment variable setup
• capture_logs - Log capture utilities

Development Workflow

• Poetry Scripts: Added poetry run test and poetry run tests commands
• Coverage Reports: Generates htmlcov/ directory and coverage.xml file
• Git Integration: Updated .gitignore with testing artifacts and development files

Validation

• 21 Validation Tests: Comprehensive test suite verifying:
  • Infrastructure setup and configuration
  • All fixtures functionality
  • Project structure integrity
  • Pytest markers and parametrization
• All Tests Passing: Infrastructure validated and ready for development

Instructions for Running Tests

Installation

poetry install

Running Tests

# Both commands work identically
poetry run test
poetry run tests

# Direct pytest with all configured options
poetry run pytest

Coverage Reports

• Terminal: Coverage summary displayed after test run
• HTML Report: Open htmlcov/index.html in browser
• XML Report: coverage.xml for CI/CD integration

Using Custom Markers

poetry run pytest -m unit          # Run only unit tests
poetry run pytest -m integration   # Run only integration tests  
poetry run pytest -m "not slow"    # Skip slow tests

Notes

• Coverage Threshold: Set to 80% - currently failing as expected since no application tests exist yet
• Poetry Lock: poetry.lock file created and should be committed for dependency locking
• Ready for Development: Infrastructure is fully functional and ready for writing actual application tests
• Fixtures Available: Comprehensive set of reusable fixtures for common testing scenarios

Next Steps

Developers can now immediately start writing tests by:

1. Creating test files in tests/unit/ or tests/integration/
2. Using the provided fixtures from conftest.py
3. Running tests with poetry run test
4. Viewing coverage reports in htmlcov/

🧪 Testing infrastructure is now complete and validated!