feat: Add comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Python Testing Infrastructure

Summary

This PR sets up a comprehensive testing infrastructure for the anime enhancement 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.

Changes Made

Package Management

• Poetry Setup: Created pyproject.toml with Poetry configuration
• Dependency Migration: Migrated all dependencies from requirements.txt to Poetry
• Python Version: Set to Python 3.10+ for compatibility with scipy and other dependencies

Testing Dependencies

Added as development dependencies:

• pytest ^8.0.0 - Main testing framework
• pytest-cov ^4.1.0 - Coverage reporting
• pytest-mock ^3.12.0 - Mocking utilities

Testing Configuration

Pytest Configuration

• Test discovery patterns for test_*.py files
• Strict markers and configuration enforcement
• Coverage integration with fail threshold at 80%
• Custom markers:
  • unit - For fast, isolated unit tests
  • integration - For tests requiring external resources
  • slow - For long-running tests

Coverage Configuration

• Source directories: architecture, degradation, loss, test_code, train_code
• Multiple report formats: terminal, HTML (htmlcov/), and XML (coverage.xml)
• Branch coverage enabled
• Exclusions for test files, cache, and virtual environments

Directory Structure

tests/
├── __init__.py
├── conftest.py          # Shared pytest fixtures
├── unit/               # Unit tests directory
│   └── __init__.py
├── integration/        # Integration tests directory
│   └── __init__.py
└── test_infrastructure_validation.py  # Validation tests

Shared Fixtures (conftest.py)

• temp_dir - Temporary directory for test files
• sample_image - Generate test images
• sample_tensor - PyTorch tensor fixtures
• mock_config - Configuration dictionary fixture
• mock_model_weights - Mock model weights file
• reset_torch_seed - Reproducible random seeds
• device - GPU/CPU device selection
• cleanup_gpu - GPU memory cleanup

Development Scripts

• poetry run test - Run all tests with coverage
• poetry run tests - Alternative command (both work)

Updated .gitignore

Added patterns for:

• Testing artifacts (.pytest_cache/, .coverage, htmlcov/, etc.)
• Claude settings (.claude/)
• Poetry/build artifacts
• Virtual environments
• IDE files
• OS-specific files

Usage Instructions

1. Install dependencies:

   poetry install --with dev

2. Run tests:

   poetry run test
   # or
   poetry run tests

3. Run specific test categories:

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

4. View coverage reports:

   • Terminal: Shown automatically after test run
   • HTML: Open htmlcov/index.html in browser
   • XML: Available at coverage.xml for CI integration

Notes

• The infrastructure is ready for immediate use - developers can start writing tests in the appropriate directories
• Coverage threshold is set to 80% but currently shows 0% as only validation tests exist
• All pytest options remain available (e.g., -v for verbose, -x to stop on first failure)
• The Poetry lock file (poetry.lock) is committed to ensure reproducible environments