feat: Set up comprehensive Python testing infrastructure

[llbbl]

Set up comprehensive Python testing infrastructure

Summary

This PR establishes a complete testing infrastructure for the Real-ESRGAN project, providing developers with a robust foundation for writing and running tests.

Changes Made

Package Management

• Configured Poetry as the package manager with a comprehensive pyproject.toml
• Migrated dependencies from existing requirements.txt and setup.py files
• Added development dependencies: pytest, pytest-cov, pytest-mock

Testing Configuration

• pytest configuration with custom markers (unit, integration, slow)
• Coverage reporting configured for HTML, XML, and terminal output
• 80% coverage threshold requirement
• Test discovery patterns for comprehensive test collection

Directory Structure

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

Shared Testing Utilities

• Comprehensive fixtures in conftest.py including:
  • Temporary directories and files
  • Sample images (RGB and grayscale)
  • Mock models, configs, devices, and loggers
  • PyTorch tensor fixtures
  • Environment variable management
  • Random seed reset for reproducibility

Development Commands

• poetry run test - Run all tests
• poetry run tests - Alternative test command
• Both commands support all standard pytest options

Project Configuration

• Updated .gitignore with testing artifacts, coverage reports, and development files
• Coverage exclusions for non-essential directories (experiments, results, datasets)
• Source code coverage tracking for both realesrgan and CSM modules

Testing the Setup

Validation Tests

The setup includes comprehensive validation tests that verify:

• All testing dependencies are properly installed
• Project structure is correct
• Custom markers are configured
• Shared fixtures work correctly
• Coverage and pytest configuration is valid

Running Tests

# Install dependencies
poetry install

# Run all tests
poetry run test

# Run with specific options
poetry run test -v --no-cov
poetry run test -m "unit"
poetry run test -k "test_setup"

Dependencies Added

Core Testing Framework

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

Existing Dependencies (Migrated)

• basicsr - Basic super-resolution framework
• numpy - Numerical computing
• opencv-python - Computer vision library
• torch >=1.7 - PyTorch deep learning framework
• cython - C extensions support

Configuration Details

Coverage Settings

• Source tracking: realesrgan and CSM modules
• Exclusions: Tests, cache, virtual environments, model files
• Reporting: HTML (htmlcov/), XML (coverage.xml), terminal
• Threshold: 80% minimum coverage required

Pytest Settings

• Test paths: tests/ directory
• File patterns: test_*.py, *_test.py
• Class patterns: Test*
• Function patterns: test_*
• Strict mode: Enabled for markers and configuration

Ready for Development

The testing infrastructure is now complete and ready for use. Developers can:

1. Write unit tests in tests/unit/
2. Write integration tests in tests/integration/
3. Use shared fixtures from conftest.py
4. Run tests with poetry run test
5. Generate coverage reports automatically
6. Use custom markers to categorize tests

All validation tests pass, confirming the infrastructure is working correctly.

🤖 Generated with Claude Code