feat: Add comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Python Testing Infrastructure

Summary

This PR establishes a comprehensive testing infrastructure for the Python project using Poetry as the package manager and pytest as the testing framework. The setup provides a solid foundation for writing and running tests with coverage reporting, mocking capabilities, and organized test structure.

Changes Made

Package Management

• Poetry Setup: Configured Poetry as the package manager with pyproject.toml
• Dependency Migration: Migrated existing dependencies to Poetry format
• Lock File: Generated poetry.lock for reproducible installations

Testing Framework

• pytest: Main testing framework with comprehensive configuration
• pytest-cov: Coverage reporting with HTML and XML output formats
• pytest-mock: Mocking utilities for unit testing

Testing Configuration (pyproject.toml)

• pytest settings: Test discovery patterns, output formatting, and strict options
• Coverage settings:
  • Source directories configuration
  • Exclusion patterns for non-testable code
  • HTML and XML report generation
  • Coverage thresholds (configurable, currently set to 80%)
• Custom markers: unit, integration, and slow for test categorization

Project Structure

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

Shared Fixtures (conftest.py)

• temp_dir: Temporary directory management
• sample_config: Mock configuration dictionary
• mock_config_file: YAML config file fixture
• sample_image_tensor: PyTorch tensor fixtures
• sample_batch: Batch data fixtures
• sample_keypoints: Keypoint data fixtures
• mock_checkpoint: Model checkpoint fixture
• sample_video_frames: Video frame data fixture
• mock_dataset_path: Dataset directory structure
• mock_logger: Logging fixture
• reset_random_seeds: Reproducible random seeds
• Device and GPU availability fixtures

Development Tools

• Makefile: Convenient commands for common tasks
  • make install: Install dependencies
  • make test / make tests: Run all tests
  • make test-unit: Run unit tests only
  • make test-integration: Run integration tests only
  • make coverage: Generate coverage report
  • make lint: Run code linting
  • make format: Format code with black and isort
  • make typecheck: Run type checking
  • make clean: Clean cache and build files

Additional Configuration

• Code formatting: Black and isort configuration
• Type checking: mypy configuration
• Linting: flake8 configuration
• .gitignore: Updated with testing artifacts and Poetry files

How to Use

Installation

# Install Poetry (if not already installed)
curl -sSL https://install.python-poetry.org | python3 -

# Install project dependencies
poetry install --no-root

# Or using make
make install

Running Tests

# Run all tests
poetry run pytest
# or
make test

# Run specific test categories
poetry run pytest -m unit        # Unit tests only
poetry run pytest -m integration # Integration tests only
poetry run pytest -m slow        # Slow tests only

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

# Generate coverage report
make coverage

Writing Tests

1. Place unit tests in tests/unit/
2. Place integration tests in tests/integration/
3. Use fixtures from conftest.py for common test data
4. Mark tests appropriately:

   @pytest.mark.unit
   def test_my_unit_test():
       assert True
   
   @pytest.mark.integration
   def test_my_integration_test():
       assert True

Validation

The setup includes test_setup_validation.py which verifies:

• Python version compatibility (3.8+)
• All testing packages are installed correctly
• All fixtures work as expected
• Project imports are accessible
• Test markers are properly configured

Run validation: poetry run pytest tests/test_setup_validation.py -v

Dependencies Added

Testing Dependencies (dev)

• pytest ^7.4.0
• pytest-cov ^4.1.0
• pytest-mock ^3.11.1

Code Quality Tools (dev)

• black ^23.7.0
• flake8 ^6.0.0
• mypy ^1.4.0
• isort ^5.12.0

Notes

• The testing infrastructure is ready for immediate use
• No actual unit tests for the codebase were written - only infrastructure setup
• Coverage is configured but will show 0% until actual tests are added
• All tools are configured with sensible defaults that can be customized as needed
• The setup supports both local development and CI/CD integration