feat: Set up 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 ready-to-use environment for writing and running tests with coverage reporting.

Changes Made

Package Management

• Poetry Setup: Configured Poetry as the primary package manager via pyproject.toml
• Dependency Migration: Migrated existing dependencies from setup.py (numpy, cython)
• Development Dependencies: Added pytest, pytest-cov, and pytest-mock as dev dependencies

Testing Configuration

• Pytest Configuration:

  • Configured test discovery patterns
  • Added coverage reporting with HTML and XML output
  • Set up custom test markers (unit, integration, slow)
  • Enabled strict mode and verbose output

• Coverage Settings:

  • Configured source directories and exclusions
  • Set up multiple report formats (terminal, HTML, XML)
  • Excluded test files and build artifacts from coverage

Directory Structure

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

Test Fixtures

Created comprehensive fixtures in conftest.py:

• temp_dir: Temporary directory management
• temp_file: Temporary file creation
• mock_config: Configuration mocking
• sample_data: Test data generation
• mock_model: Model mocking
• cleanup_files: File cleanup utility
• capture_logs: Log capturing
• benchmark_timer: Performance timing
• mock_file_system: File system mocking

Additional Setup

• Updated .gitignore with testing artifacts and common Python excludes
• Created validation tests to verify the infrastructure works correctly
• Configured Poetry scripts for running tests (poetry run test and poetry run tests)

How to Use

Install Dependencies

poetry install

Run Tests

# Run all tests with coverage
poetry run test

# Alternative command
poetry run tests

# Run specific test markers
poetry run pytest -m unit
poetry run pytest -m integration
poetry run pytest -m "not slow"

# Run with specific options
poetry run pytest -v --cov-report=html

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 needs
4. Mark tests appropriately with @pytest.mark.unit, @pytest.mark.integration, or @pytest.mark.slow

Coverage Reports

• Terminal: Displayed after each test run
• HTML: Generated in htmlcov/ directory
• XML: Generated as coverage.xml for CI/CD integration

Notes

• Coverage threshold is currently set to 0% to allow initial setup without existing tests
• Developers should adjust the threshold in pyproject.toml as tests are added
• The validation test suite (test_infrastructure_validation.py) verifies all components work correctly
• All Cython extensions (.pyx files) are excluded from coverage reporting