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 WLASL Python project using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Setup: Initialized Poetry as the package manager with pyproject.toml
• Dependencies: Added testing dependencies as development dependencies:
  • pytest ^7.4.0 - Core testing framework
  • pytest-cov ^4.1.0 - Coverage reporting
  • pytest-mock ^3.11.1 - Mocking utilities

Testing Configuration

• pytest Configuration: Configured in pyproject.toml with:

  • Test discovery patterns for flexible test file naming
  • Coverage settings with 80% threshold requirement
  • HTML and XML coverage report generation
  • Strict markers and configuration
  • Custom markers: unit, integration, slow

• Coverage Configuration: Set up with:

  • Source directory tracking (code/)
  • Exclusion patterns for test files and virtual environments
  • Branch coverage enabled
  • Multiple report formats

Directory Structure

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

Testing Fixtures

Created comprehensive shared fixtures in conftest.py:

• temp_dir - Temporary directory with automatic cleanup
• mock_config - Mock configuration object
• sample_json_data - Sample JSON test data
• mock_video_file - Mock video file creation
• mock_dataset_dir - Complete mock dataset structure
• mock_model - Mock ML model object
• mock_data_loader - Mock data loader
• env_setup - Environment variable setup
• capture_logs - Log capture during tests
• cleanup_test_files - Automatic test file cleanup
• mock_ini_config - Mock INI configuration files

Development Experience

• Commands: Both poetry run test and poetry run tests work
• Validation: Created validation tests to verify the infrastructure
• Git Integration: Updated .gitignore with comprehensive patterns

How to Use

1. Install dependencies:

   poetry install --with test
   

2. Run all tests:

   poetry run test
   # or
   poetry run tests
   

3. Run specific test categories:

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

4. Run with coverage:

   poetry run pytest --cov
   

5. Generate coverage reports:

   • HTML report: htmlcov/index.html
   • XML report: coverage.xml

Notes

• The infrastructure is ready for immediate test development
• Coverage threshold is set to 80% but will initially fail since there's no source code to cover
• All validation tests pass, confirming the setup is working correctly
• Poetry.lock file is not gitignored to ensure reproducible builds