feat: Set up comprehensive Python testing infrastructure

[llbbl]

Set up comprehensive Python testing infrastructure

Summary

This PR establishes a complete testing infrastructure for the davemail Python project, providing developers with a ready-to-use environment for writing and running tests.

Changes Made

Package Management

• Poetry Configuration: Set up pyproject.toml with Poetry as the package manager
• Dependency Management: Migrated existing dependencies (configobj, notmuch) and added testing dependencies
• Development Dependencies: Added pytest (7.4.0+), pytest-cov (4.1.0+), and pytest-mock (3.11.0+)

Testing Configuration

• Pytest Settings: Configured comprehensive pytest options in pyproject.toml including:
  • Test discovery patterns for various file naming conventions
  • Strict configuration and markers enforcement
  • Verbose output formatting
• Custom Markers: Added three test markers for categorization:
  • @pytest.mark.unit - Unit tests
  • @pytest.mark.integration - Integration tests
  • @pytest.mark.slow - Slow-running tests
• Coverage Configuration: Set up coverage reporting with:
  • 80% coverage threshold requirement
  • HTML reports (htmlcov/ directory)
  • XML reports (coverage.xml file)
  • Exclusion of test files and virtual environments

Directory Structure

• Testing Directories: Created organized test structure:

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

Testing Fixtures & Utilities

• Shared Fixtures: Comprehensive conftest.py with fixtures for:
  • Temporary directories and files
  • Mock configuration objects (ConfigObj)
  • Mock notmuch database and email objects
  • Mock subprocess calls
  • Sample email content for testing
  • Environment cleanup utilities

Project Configuration

• Updated .gitignore: Added comprehensive exclusions for:
  • Testing artifacts (.pytest_cache/, htmlcov/, coverage.xml)
  • Virtual environments (.venv/, .env)
  • IDE files (.vscode/, .idea/)
  • Build artifacts (dist/, *.egg-info/)
  • Claude Code settings (.claude/*)

Validation

• Infrastructure Tests: Created validation test suite to verify:
  • Python version compatibility (3.8+)
  • Project structure correctness
  • Pytest configuration accessibility
  • Fixture availability and functionality
  • Coverage configuration
  • Custom marker functionality

How to Run Tests

Basic Test Commands

# Install dependencies
poetry install

# Run all tests
poetry run pytest

# Run tests with coverage
poetry run pytest --cov

# Run without coverage (for development)
poetry run pytest --no-cov

# Run specific test categories
poetry run pytest -m unit          # Unit tests only
poetry run pytest -m integration   # Integration tests only
poetry run pytest -m slow          # Slow tests only

Coverage Reports

# Generate HTML coverage report
poetry run pytest --cov --cov-report=html

# View coverage report
open htmlcov/index.html  # macOS
xdg-open htmlcov/index.html  # Linux

Test Discovery

Pytest will automatically discover tests following these patterns:

• Files: test_*.py, *_test.py
• Classes: Test*
• Functions: test_*

Dependencies Added

Production Dependencies

• configobj ^5.0 - Configuration file parsing
• notmuch * - Email indexing and search

Development Dependencies

• pytest ^7.4.0 - Testing framework
• pytest-cov ^4.1.0 - Coverage reporting
• pytest-mock ^3.11.0 - Mocking utilities

Notes

• Coverage Threshold: Set to 80% - tests will fail if coverage drops below this threshold
• Lock File: poetry.lock is tracked in git for reproducible builds
• Python Version: Configured for Python 3.8+ compatibility
• Ready for Development: Infrastructure is complete - developers can immediately start writing tests

The testing infrastructure is now fully functional and ready for use. All validation tests pass, confirming the setup is working correctly.