feat: Set up comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Python Testing Infrastructure

Summary

This PR sets up a comprehensive testing infrastructure for the Python project using Poetry as the package manager and pytest as the testing framework. The setup provides a ready-to-use testing environment where developers can immediately start writing tests.

Changes Made

Package Management

• Poetry Configuration: Created pyproject.toml with Poetry as the package manager
• Dependency Migration: Migrated existing dependencies from requirement.txt to Poetry
• Lock File: Generated poetry.lock to ensure reproducible builds

Testing Dependencies

Added the following testing tools as development dependencies:

• pytest - Modern testing framework
• pytest-cov - Coverage reporting plugin
• pytest-mock - Mocking utilities

Testing Configuration

Configured pytest in pyproject.toml with:

• Test discovery patterns
• Coverage reporting with 80% threshold
• HTML and XML coverage reports
• Strict markers and configuration
• Custom test markers: unit, integration, slow

Directory Structure

Created organized testing structure:

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

Shared Fixtures

Created comprehensive fixtures in conftest.py:

• temp_dir - Temporary directory management
• mock_config - Mock configuration objects
• sample_image_tensor - Test image tensors
• mock_dataset - Mock dataset for testing
• mock_dataloader - Mock dataloader
• cleanup_gpu - GPU memory cleanup
• mock_visdom - Mocked visualization
• sample_options - Sample command line options
• And more...

Additional Setup

• Updated .gitignore with testing artifacts and Claude settings
• Created validation tests to verify the infrastructure works correctly

How to Use

Installing Dependencies

poetry install

Running Tests

You can run tests using either:

poetry run pytest

Running Tests with Coverage

Coverage is enabled by default:

poetry run pytest

Running Specific Test Types

# Run only unit tests
poetry run pytest -m unit

# Run only integration tests  
poetry run pytest -m integration

# Exclude slow tests
poetry run pytest -m "not slow"

Coverage Reports

• HTML report: htmlcov/index.html
• XML report: coverage.xml
• Terminal report: Shown after test run

Notes

• The project uses Poetry in non-package mode since it's not a distributable package
• Coverage threshold is set to 80% - tests will fail if coverage drops below this
• All test-related files are properly gitignored except the lock file
• The infrastructure is ready for immediate use - developers can start writing tests right away

Validation

All validation tests pass successfully:

• ✅ Testing dependencies installed
• ✅ Directory structure created
• ✅ Fixtures available and working
• ✅ Test markers configured
• ✅ Coverage reporting configured