feat: Set up comprehensive Python testing infrastructure

[llbbl]

Python Testing Infrastructure Setup

Summary

This PR establishes a complete testing infrastructure for the alarm-beep-detect Python project. The setup provides a professional development environment with proper dependency management, comprehensive testing configuration, and ready-to-use fixtures for audio-related testing.

Key Changes Made

• Package Management: Migrated from requirements.txt to Poetry with pyproject.toml
• Testing Framework: Configured pytest with coverage reporting (80% threshold)
• Directory Structure: Created organized test directories (tests/unit/, tests/integration/)
• Shared Fixtures: Added comprehensive conftest.py with audio testing utilities
• Development Tools: Added pytest-cov, pytest-mock, and custom test markers
• Configuration: Set up proper .gitignore and pytest configuration
• Validation: Included tests to verify the infrastructure works correctly

Testing Infrastructure Components

Package Management (Poetry)

• pyproject.toml: Central configuration for dependencies, scripts, and tools
• Dependencies: Core packages (numpy) and optional audio (PyAudio) support
• Dev Dependencies: pytest, pytest-cov, pytest-mock for comprehensive testing

Test Configuration

• Coverage: 80% threshold with HTML/XML reporting in htmlcov/ and coverage.xml
• Markers: Custom markers for unit, integration, and slow tests
• Discovery: Automatic test discovery with standard naming patterns
• Output: Detailed reporting with missing coverage information

Shared Fixtures (conftest.py)

• File Operations: temp_dir, temp_file for filesystem testing
• Audio Testing: mock_pyaudio, sample_audio_data, sample_noise_data
• Configuration: mock_audio_config, mock_alarm_config for consistent test setup
• Environment: Automatic test environment setup and audio warning suppression

Directory Structure

tests/
├── __init__.py
├── conftest.py              # Shared fixtures and configuration
├── test_setup_validation.py # Infrastructure validation tests
├── unit/                    # Fast, isolated unit tests
│   └── __init__.py
└── integration/             # Slower integration tests
    └── __init__.py

Running Tests

Basic test execution:

# Run all tests
poetry run pytest

# Run with coverage
poetry run pytest --cov

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

Alternative commands:

poetry run test    # Equivalent to pytest
poetry run tests   # Alternative command

Coverage reporting:

• Terminal output with missing lines
• HTML report in htmlcov/index.html
• XML report in coverage.xml for CI/CD integration

Development Notes

• PyAudio: Made optional to support environments without audio hardware
  • Install with: poetry install --extras audio
  • Mocked in tests for consistent behavior
• Python Version: Requires Python 3.9+ for numpy compatibility
• Coverage: Configured to exclude test files, build artifacts, and virtual environments
• Validation: Run poetry run pytest tests/test_setup_validation.py to verify setup

Next Steps

The testing infrastructure is now ready for developers to:

1. Write Unit Tests: Add tests in tests/unit/ for individual functions
2. Add Integration Tests: Create tests in tests/integration/ for complete workflows
3. Use Fixtures: Leverage audio-specific fixtures for consistent test setup
4. Monitor Coverage: Maintain 80% coverage threshold with detailed reporting
5. Run CI/CD: Use coverage.xml and junit-xml output for automated testing

This foundation provides everything needed to maintain high code quality through comprehensive testing.