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 Zero-Knowledge Python project using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Setup: Created pyproject.toml with complete project configuration
• Dependency Migration: Migrated existing dependencies from requirements.txt to Poetry
• Development Dependencies: Added pytest, pytest-cov, and pytest-mock as dev dependencies

Testing Configuration

• pytest Configuration:

  • Set up test discovery patterns for test_*.py and *_test.py files
  • Configured strict mode with proper error handling
  • Added custom markers: unit, integration, and slow

• Coverage Settings:

  • Configured 80% coverage threshold (currently set to 0 for infrastructure validation)
  • Set up HTML, XML, and terminal coverage reports
  • Excluded test files and __init__.py files from coverage

Directory Structure

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

Testing Fixtures

Created comprehensive fixtures in conftest.py:

• temp_dir: Temporary directory management
• mock_config: Configuration dictionary for testing
• mock_logger: Mock logger with all standard methods
• sample_data: Sample test data structures
• mock_file_system: File system operations helper
• environment_variables: Safe environment variable manipulation
• mock_random: Deterministic random number generation
• capture_logs: Log capture for testing

Additional Setup

• Scripts: Added poetry run test and poetry run tests commands
• .gitignore: Updated with comprehensive Python testing patterns and Claude-specific entries
• Validation Tests: Created tests to verify the infrastructure works correctly

How to Use

1. Install dependencies:

   poetry install

2. Run tests:

   poetry run test
   # or
   poetry run tests

3. Run specific test 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

4. Generate coverage report:

   poetry run pytest --cov-report=html
   # Open htmlcov/index.html in browser

Notes

• The coverage threshold is currently set to 0% in pyproject.toml to allow the infrastructure validation tests to pass. This should be changed to 80% when actual tests are added.
• Poetry will create a virtual environment in .venv/ directory
• The poetry.lock file should be committed to ensure reproducible builds
• All test dependencies are properly isolated as development dependencies

Next Steps

With this infrastructure in place, developers can now:

1. Write unit tests in the tests/unit/ directory
2. Write integration tests in the tests/integration/ directory
3. Use the provided fixtures for common testing scenarios
4. Run tests with coverage reporting to ensure code quality