feat: Add comprehensive Python testing infrastructure

[llbbl]

Add Comprehensive Python Testing Infrastructure

Summary

This PR sets up a complete testing infrastructure for the Python project, providing a foundation for writing and running tests with proper tooling and configuration.

Changes Made

📦 Package Management

• Poetry Setup: Created pyproject.toml with Poetry configuration as the package manager
• Dependency Migration: Migrated existing numpy dependency from requirements.txt
• Poetry Lock: Added poetry.lock to .gitignore to avoid version conflicts

🧪 Testing Dependencies

Added as development dependencies:

• pytest (^7.4.0) - Main testing framework
• pytest-cov (^4.1.0) - Coverage reporting plugin
• pytest-mock (^3.11.0) - Mocking utilities

⚙️ Configuration

pytest Configuration (pyproject.toml)

• Test discovery patterns for test_*.py and *_test.py files
• Strict markers and configuration enforcement
• Coverage reporting with HTML and XML output
• Custom markers: unit, integration, slow

Coverage Configuration

• Source includes all project files
• Excludes test files, cache directories, virtual environments
• Configured exclusion patterns for non-testable code

📁 Directory Structure

tests/
├── __init__.py
├── conftest.py          # Shared fixtures and configuration
├── test_setup_validation.py  # Validation tests
├── unit/
│   └── __init__.py
└── integration/
    └── __init__.py

🔧 Shared Fixtures (conftest.py)

• temp_dir: Temporary directory management
• mock_config: Configuration dictionary for testing
• sample_text_data: Sample text data for testing
• mock_model_weights: Mock file creation
• env_var_backup: Environment variable isolation
• reset_random_seeds: Reproducible test runs
• capture_logs: Log message capture

📝 Additional Updates

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

Usage Instructions

Install Dependencies

poetry install

Run Tests

# Run all tests
poetry run test

# Alternative command (both work)
poetry run tests

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

# Run without coverage
poetry run pytest --no-cov

# Run specific test file
poetry run pytest tests/test_setup_validation.py

Coverage Reports

• Terminal: Coverage summary shown after each test run
• HTML Report: Generated in htmlcov/ directory
• XML Report: Generated as coverage.xml for CI integration

Notes

• The infrastructure is set up but does not include actual unit tests for the codebase
• Coverage threshold is currently not enforced (removed --cov-fail-under=80 from default options)
• All pytest standard options remain available for use
• The validation test suite confirms all components are working correctly

Validation Results

All validation tests pass successfully:

• ✅ pytest installation verified
• ✅ Project structure validated
• ✅ Fixtures working correctly
• ✅ Custom markers registered
• ✅ Coverage configuration functional
• ✅ Both test and tests commands operational