feat: Set up Python testing infrastructure with Poetry

[llbbl]

Python Testing Infrastructure Setup

Summary

This PR sets up a complete testing infrastructure for the Python scripts in this Ansible playbooks repository. The infrastructure uses Poetry as the package manager and pytest as the testing framework, providing a modern and efficient testing environment.

Changes Made

Package Management

• Poetry Setup: Introduced Poetry as the package manager through pyproject.toml
• Dependencies: Added testing dependencies as development dependencies:
  • pytest (^8.0.0) - Core testing framework
  • pytest-cov (^5.0.0) - Coverage reporting
  • pytest-mock (^3.14.0) - Mocking utilities

Testing Configuration

• pytest Configuration: Comprehensive pytest settings in pyproject.toml including:

  • Test discovery patterns for files, classes, and functions
  • Coverage reporting with HTML and XML output formats
  • Custom markers: unit, integration, and slow
  • Strict mode enabled for better test quality
  • Coverage threshold currently set to 0% (should be updated to 80% when adding actual code tests)

• Coverage Configuration:

  • Source directory set to scripts/python
  • Branch coverage enabled
  • Exclusions for test files and common patterns
  • Multiple report formats (terminal, HTML, XML)

Directory Structure

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

Testing Fixtures

Created comprehensive fixtures in conftest.py:

• temp_dir: Temporary directory management
• mock_config: Mock configuration data
• sample_yaml_content: Sample YAML for Ansible testing
• sample_json_data: Sample JSON data
• mock_env_vars: Environment variable mocking
• clean_environment: Clean test environment
• mock_file_system: Mock file system structure
• Auto-hooks for test organization and marking

Development Commands

Poetry script commands configured:

• poetry run test - Run all tests
• poetry run tests - Alternative command (both work)

Git Configuration

Updated .gitignore with:

• Python artifacts (__pycache__/, *.pyc, etc.)
• Testing artifacts (.pytest_cache/, .coverage, htmlcov/)
• Virtual environments
• IDE files
• Claude settings (.claude/*)
• Note: poetry.lock is NOT ignored (as per best practices)

How to Use

1. Install Poetry (if not already installed):

   curl -sSL https://install.python-poetry.org | python3 -

2. Install Dependencies:

   poetry install

3. Run Tests:

   poetry run test
   # or
   poetry run tests

4. Run Tests with Specific Markers:

   poetry run pytest -m unit      # Run only unit tests
   poetry run pytest -m integration  # Run only integration tests
   poetry run pytest -m "not slow"   # Skip slow tests

5. View Coverage Report:

   # After running tests, open the HTML report
   open htmlcov/index.html  # macOS
   xdg-open htmlcov/index.html  # Linux

Notes

• The coverage threshold is currently set to 0% to allow the infrastructure setup to pass. This should be updated to 80% (as commented in the code) once actual Python code tests are added.
• All validation tests are passing, confirming the infrastructure is properly set up.
• The infrastructure is ready for developers to immediately start writing tests for the Python scripts in the repository.

Future Recommendations

1. Update coverage threshold to 80% when adding actual code tests
2. Consider adding pre-commit hooks for running tests
3. Add CI/CD integration for automated testing
4. Consider adding additional testing tools like pytest-xdist for parallel test execution