feat: Add comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Comprehensive Python Testing Infrastructure

Summary

This PR establishes a complete testing infrastructure for the federated learning project, migrating from requirements.txt to Poetry for modern dependency management and setting up a robust testing framework.

Changes Made

Package Management Migration

• ✅ Migrated to Poetry: Created pyproject.toml with modern Poetry configuration
• ✅ Updated Dependencies: Migrated from legacy versions to compatible modern packages:
  • numpy: 1.20.1 → ^1.24.0
  • torch: 1.8.0 → ^2.0.0
  • torchvision: 0.9.0 → ^0.15.0
  • scipy: 1.4.1 → ^1.16.0
  • And other core dependencies with compatible versions
• ✅ Python Version: Updated to require Python ^3.11 for compatibility

Testing Framework Setup

• ✅ pytest Configuration: Comprehensive pytest setup in pyproject.toml with:
  • Test discovery patterns for test_*.py and *_test.py
  • Custom markers: unit, integration, slow
  • Strict configuration and verbose output
• ✅ Coverage Reporting: Configured pytest-cov with:
  • 80% coverage threshold requirement
  • HTML reports (htmlcov/) and XML reports (coverage.xml)
  • Source coverage for models/, modules/, data/, misc/ directories
  • Intelligent exclusions for test files and third-party code

Project Structure

• ✅ Testing Directories:

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

Shared Test Fixtures

Added comprehensive fixtures in conftest.py:

• temp_dir: Temporary directory management
• mock_config: Mock configuration objects
• sample_tensor & sample_numpy_array: Test data
• mock_client, mock_server, mock_model: Federated learning mocks
• mock_dataloader: Data loading simulation
• temp_model_file & temp_data_file: Temporary file fixtures
• mock_logger: Logging mock utilities

Development Commands

• ✅ Poetry Scripts: Added convenient commands:
  • poetry run test - Run all tests
  • poetry run tests - Alternative command (both work)
• ✅ Standard pytest options: All pytest CLI options available

Additional Improvements

• ✅ Updated .gitignore: Added comprehensive exclusions for:
  • Testing artifacts (.pytest_cache/, .coverage, htmlcov/)
  • Python build artifacts (pycache/, *.pyc, etc.)
  • Virtual environments and IDE files
  • Claude settings (.claude/*)
• ✅ Validation Tests: Created infrastructure tests to verify:
  • pytest functionality
  • Import capabilities
  • Project structure access
  • Fixture availability
  • Marker functionality
  • Coverage integration

Testing Instructions

Install Dependencies

poetry install

Run Tests

# Run all tests with coverage
poetry run pytest

# 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

# Run with verbose output
poetry run pytest -v

# Alternative command
poetry run tests

View Coverage Reports

• Terminal: Coverage summary shown after test run
• HTML: Open htmlcov/index.html in browser for detailed report
• XML: coverage.xml for CI/CD integration

Notes

• Poetry Lock File: The poetry.lock file is included and should be committed for reproducible builds
• Python Version: Updated to require Python 3.11+ for modern dependency compatibility
• Coverage Threshold: Set to 80% - tests will fail if coverage drops below this
• Ready for Development: Infrastructure is complete - developers can immediately start writing unit and integration tests

Validation

✅ All infrastructure validation tests pass
✅ Coverage reporting generates correctly
✅ Both poetry run test and poetry run tests work
✅ HTML and XML coverage reports created
✅ All fixtures and markers functional

🤖 Generated with Claude Code