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 speechmetrics project, migrating from setup.py to Poetry for modern dependency management and adding pytest with coverage reporting.

Changes Made

Package Management Migration

• Created pyproject.toml with Poetry configuration
• Migrated all dependencies from setup.py to Poetry format
• Added development dependencies group for testing tools

Testing Setup

• Testing Framework: pytest (^7.4.0)
• Coverage Tool: pytest-cov (^4.1.0)
• Mocking Library: pytest-mock (^3.11.0)

Configuration

• pytest configuration in pyproject.toml:

  • Automatic test discovery in tests/ directory
  • Coverage reporting with 80% threshold
  • Multiple output formats (terminal, HTML, XML)
  • Custom markers: unit, integration, slow
  • Strict marker enforcement

• Coverage configuration:

  • Source directory: speechmetrics
  • Excluded: test files, __init__.py, setup files
  • Detailed branch coverage reporting

Directory Structure

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

Shared Fixtures (conftest.py)

• temp_dir: Temporary directory management
• sample_audio_data: Generate test audio arrays
• sample_rate: Standard 16kHz sample rate
• mock_config: Configuration dictionary for testing
• example_wav_file: Create temporary WAV files
• reset_environment: Environment variable isolation
• mock_tensorflow: TensorFlow mocking for faster tests
• noisy_audio_pair: Clean/noisy audio pair generation

Poetry Scripts

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

.gitignore Updates

• Added testing artifacts: .pytest_cache/, .coverage, htmlcov/, coverage.xml
• Added Claude settings: .claude/*
• Added IDE files and virtual environments
• Note: poetry.lock is intentionally NOT ignored (should be committed)

How to Use

1. Install Poetry (if not already installed):

   curl -sSL https://install.python-poetry.org | python3 -

2. Install dependencies:

   poetry install --with dev

3. Run tests:

   poetry run test
   # or
   poetry run tests

4. Run specific test types:

   poetry run pytest -m unit        # Unit tests only
   poetry run pytest -m integration # Integration tests only
   poetry run pytest -m "not slow"  # Exclude slow tests

5. View coverage report:

   # Terminal report is shown automatically
   # HTML report available at: htmlcov/index.html

Notes

• The infrastructure is ready for developers to start writing tests immediately
• All pytest standard options are available through the Poetry scripts
• Coverage threshold is set to 80% - builds will fail if coverage drops below this
• Validation tests are included to verify the setup works correctly
• Git dependencies in pyproject.toml may need adjustment based on the specific versions required

Next Steps

Developers can now:

1. Write unit tests in tests/unit/
2. Write integration tests in tests/integration/
3. Use the provided fixtures for common testing scenarios
4. Run tests locally before committing changes