feat: add comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Python Testing Infrastructure

Summary

This PR sets up a complete testing infrastructure for the video-depixelation project using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Setup: Created pyproject.toml with Poetry configuration
• Dependency Management: Migrated from manual dependency management to Poetry
• Lock File: Generated poetry.lock for reproducible builds

Testing Framework

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

Project Structure

tests/
├── __init__.py
├── README.md           # Testing documentation
├── conftest.py         # Shared fixtures and configuration
├── test_setup_validation.py  # Infrastructure validation tests
├── unit/              # Unit tests directory
│   └── __init__.py
└── integration/       # Integration tests directory
    └── __init__.py

Configuration

pytest Configuration (pyproject.toml)

• Test discovery patterns for flexible naming
• Coverage reporting with multiple output formats
• Custom markers: unit, integration, slow, gpu
• Strict mode for better error detection
• Coverage threshold initially set to 0% (to be increased as tests are added)

Coverage Settings

• Source directories: v1/ and v2/
• Exclusions for test files, caches, and virtual environments
• HTML report generation in htmlcov/
• XML report for CI integration

Fixtures (conftest.py)

• temp_dir: Temporary directory with automatic cleanup
• mock_config: Configuration dictionary for testing
• sample_image: PIL Image creation
• sample_tensor: PyTorch tensor creation
• mock_frames_folder: Sample video frames setup
• output_folders: All project output directories
• device: CPU/CUDA device selection
• cleanup_cuda: Automatic CUDA cache cleanup

Development Workflow

Running Tests

# Install dependencies
poetry install

# Run all tests
poetry run pytest

# Run with specific options
poetry run pytest -v                    # Verbose
poetry run pytest -m unit              # Only unit tests
poetry run pytest --no-cov             # Without coverage
poetry run pytest -k "test_name"       # Specific test pattern

Coverage Reports

# Terminal coverage report
poetry run pytest --cov-report=term

# HTML coverage report
poetry run pytest --cov-report=html
# Open htmlcov/index.html in browser

Additional Updates

• .gitignore: Added entries for testing artifacts, coverage reports, Python caches, virtual environments, and IDE files
• Validation Tests: Created comprehensive tests to verify the infrastructure works correctly

Dependencies Added

Production Dependencies

• torch ^2.0.0
• torchvision ^0.15.0
• pillow ^10.0.0

Development Dependencies

• pytest ^7.4.0
• pytest-cov ^4.1.0
• pytest-mock ^3.11.0

Next Steps

1. Developers can now start writing unit tests for existing functionality
2. Coverage threshold should be gradually increased as tests are added
3. Consider adding pre-commit hooks to run tests automatically
4. Set up CI/CD to run tests on pull requests

Testing the Setup

The infrastructure has been validated with 18 passing tests that verify:

• All dependencies are properly installed
• Fixtures work correctly
• Test markers are recognized
• Project structure is valid
• Coverage reporting functions properly

Run poetry run pytest to see the validation tests in action.