feat: Set up comprehensive Python testing infrastructure

[llbbl]

Set up comprehensive Python testing infrastructure

Summary

This PR establishes a complete testing infrastructure for the Python API demonstration project using Poetry as the package manager and pytest as the testing framework. The setup provides developers with a ready-to-use testing environment that includes coverage reporting, mocking capabilities, and organized test structures.

Changes Made

Package Management & Dependencies

• Poetry Configuration: Set up pyproject.toml with Poetry configuration for project management
• Testing Dependencies: Added pytest, pytest-cov, and pytest-mock as development dependencies
• Python Version: Configured for Python 3.8+ compatibility

Testing Configuration

• pytest Configuration: Comprehensive pytest settings including:
  • Test discovery patterns for files, classes, and functions
  • Coverage reporting with 80% threshold requirement
  • HTML and XML coverage report generation
  • Custom markers for unit, integration, and slow tests
  • Strict configuration for consistent behavior

Project Structure

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

Shared Testing Fixtures

Created comprehensive fixtures in tests/conftest.py:

• temp_dir and temp_file for file system testing
• mock_env_vars for environment variable mocking
• sample_config for configuration testing
• mock_api_response and mock_error_response for API testing
• mock_datetime for time-dependent testing
• Additional utility fixtures for common testing scenarios

Coverage Configuration

• Source Coverage: Tracks coverage for the code/ directory
• Exclusions: Properly excludes test files, virtual environments, and build artifacts
• Reporting: Generates term, HTML, and XML coverage reports
• Thresholds: Enforces 80% minimum coverage requirement

Development Environment

• .gitignore: Added comprehensive exclusions for:
  • Python artifacts (__pycache__/, *.pyc, dist/, etc.)
  • Testing artifacts (.pytest_cache/, .coverage, htmlcov/)
  • Virtual environments and IDE files
  • Claude Code settings (.claude/*)

Testing Infrastructure Validation

The setup includes validation tests (tests/test_infrastructure.py) that verify:

• ✅ pytest functionality and Python version compatibility
• ✅ Project structure and required directories
• ✅ Shared fixtures availability and functionality
• ✅ Environment variable mocking capabilities
• ✅ Custom markers for test categorization
• ✅ pytest-mock integration
• ✅ Code directory accessibility for imports

Usage Instructions

Running Tests

# Install dependencies
poetry install

# Run all tests
poetry run pytest

# Run tests with coverage
poetry run pytest --cov=code

# Run only unit tests
poetry run pytest -m unit

# Run tests excluding slow ones
poetry run pytest -m "not slow"

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

Coverage Reports

• Terminal: Coverage summary displayed after test runs
• HTML: Detailed coverage report in htmlcov/index.html
• XML: Machine-readable report in coverage.xml for CI integration

Adding New Tests

1. Create test files in appropriate directories (tests/unit/ or tests/integration/)
2. Use shared fixtures from conftest.py
3. Apply appropriate markers (@pytest.mark.unit, @pytest.mark.integration, @pytest.mark.slow)
4. Follow naming conventions (test_*.py, Test* classes, test_* functions)

Notes

• No Lock File Exclusion: The poetry.lock file is intentionally not in .gitignore to ensure consistent dependency versions across environments
• Coverage Threshold: Set to 80% minimum - adjust in pyproject.toml if needed
• Ready for CI: Configuration supports common CI/CD systems with XML coverage reporting
• Extensible: Easy to add additional testing dependencies or configuration as needed

🤖 Generated with Claude Code