feat: Set up Python testing infrastructure with Poetry

[llbbl]

Set Up Python Testing Infrastructure

Summary

This PR establishes a complete testing infrastructure for the Python project using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Setup: Created pyproject.toml with Poetry configuration
• 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:

  • Test discovery patterns for test_*.py and *_test.py files
  • Strict markers and configuration
  • Custom markers: unit, integration, slow
  • Verbose output with detailed failure reports

• Coverage Configuration:

  • 80% coverage threshold requirement
  • HTML and XML report generation
  • Exclusion patterns for test files, virtual environments, and boilerplate code
  • Branch coverage tracking

Directory Structure

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

Testing Fixtures

Created comprehensive shared fixtures in conftest.py:

• temp_dir - Temporary directory management
• temp_file - Temporary file creation
• mock_env_vars - Environment variable mocking
• sample_markdown_file - Test data generation
• sample_config - Configuration mocking
• mock_file_system - File system structure mocking
• capture_stdout - Output capturing

Development Commands

Configured Poetry scripts for running tests:

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

Additional Setup

• Updated .gitignore with Python and testing patterns
• Added Claude settings exclusion (.claude/*)
• Created validation tests to verify the infrastructure

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 Specific Test Categories:

   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 Reports:

   • Terminal: Automatically shown after test run
   • HTML: Open htmlcov/index.html in browser
   • XML: Available at coverage.xml for CI integration

Notes

• The infrastructure is ready for immediate test development
• Coverage threshold is set to 80% but can be adjusted in pyproject.toml
• All pytest options are available through the Poetry commands
• The poetry.lock file is NOT gitignored and should be committed for reproducible builds
• Validation tests are included to ensure the infrastructure works correctly