feat: Set up comprehensive Python testing infrastructure with Poetry

[llbbl]

Set up 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 solid foundation for writing and running tests with coverage reporting and organized test structure.

Changes Made

Package Management

• Poetry Configuration: Created pyproject.toml with Poetry configuration as the project's package manager
• Testing Dependencies: Added pytest, pytest-cov, and pytest-mock as development dependencies

Testing Configuration

• pytest Settings: Configured pytest with:

  • Test discovery patterns for multiple naming conventions
  • Coverage reporting with HTML and XML output formats
  • Strict markers and configuration options
  • Custom markers for test categorization (unit, integration, slow)
  • Automatic output formatting and failure handling

• Coverage Settings: Set up coverage.py with:

  • Source directory configuration
  • Exclusion patterns for test files, virtual environments, and generated code
  • Report formatting options and precision settings

Directory Structure

tests/
├── __init__.py
├── conftest.py
├── test_infrastructure_validation.py
├── unit/
│   └── __init__.py
└── integration/
    └── __init__.py

Shared Fixtures (conftest.py)

Created comprehensive pytest fixtures including:

• temp_dir: Temporary directory creation and cleanup
• mock_config: Sample configuration dictionary
• sample_data: Test data structures
• mock_json_file, mock_text_file, mock_python_file: File creation helpers
• env_vars: Environment variable management
• capture_logs: Log capture utility
• cleanup_test_files: Automatic test file cleanup

Additional Setup

• Updated .gitignore with testing artifacts and Claude settings
• Created validation tests to ensure the infrastructure works correctly
• All 22 validation tests pass successfully

Running Tests

To run tests, use the following command:

poetry run pytest

Additional pytest options are available:

• poetry run pytest -v - Verbose output
• poetry run pytest tests/unit/ - Run only unit tests
• poetry run pytest -m integration - Run only integration tests
• poetry run pytest --cov-report=html - Generate HTML coverage report

Dependencies Added

• pytest (^8.3.4): Core testing framework
• pytest-cov (^5.0.0): Coverage plugin for pytest
• pytest-mock (^3.14.0): Mocking utilities integrated with pytest

Notes

• Poetry lock file (poetry.lock) should be committed to version control for reproducible builds
• Coverage threshold is currently disabled but can be enabled by adding --cov-fail-under=80 to pytest options
• The infrastructure is ready for immediate test development - developers can start writing tests in the appropriate directories