feat: Set up comprehensive Python testing infrastructure

[llbbl]

Set up Python Testing Infrastructure

Summary

This PR establishes a comprehensive testing infrastructure for the Python project, providing a ready-to-use environment for developers to write and run tests efficiently.

Changes Made

Package Management

• Set up Poetry as the package manager with pyproject.toml configuration
• Migrated dependencies from requirements.txt to Poetry format
• Upgraded torch version to ^2.0.0 for better compatibility

Testing Framework Setup

• Added testing dependencies:
  • pytest (^7.4.0) - Main testing framework
  • pytest-cov (^4.1.0) - Coverage reporting
  • pytest-mock (^3.11.1) - Mocking utilities
• Configured pytest with comprehensive settings in pyproject.toml:
  • Test discovery patterns
  • 80% coverage threshold requirement
  • HTML, XML, and terminal coverage reports
  • Custom markers: unit, integration, slow
  • Strict configuration validation

Directory Structure

• Created testing directories:

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

Shared Testing Utilities

• Created conftest.py with comprehensive fixtures:
  • temp_dir - Temporary directory for test files
  • temp_file - Temporary file management
  • mock_config - Mock configuration objects
  • mock_torch_device - GPU-free torch device mocking
  • mock_model - RWKV model mocking
  • mock_tokenizer - Tokenizer mocking
  • mock_flask_app - Flask application mocking
  • mock_requests - HTTP requests mocking
  • reset_environment - Environment variable isolation
  • capture_logs - Log capture utilities

Development Commands

• Set up Poetry scripts:
  • poetry run test - Run all tests
  • poetry run tests - Alternative command
• Both commands support all standard pytest options and flags

Configuration Files

• Updated .gitignore with testing-related entries:
  • Testing artifacts (.pytest_cache/, .coverage, htmlcov/)
  • Build artifacts (build/, dist/, *.egg-info/)
  • Virtual environments and IDE files
  • Claude settings (.claude/*)

Testing Infrastructure Features

Coverage Reporting

• Minimum 80% coverage threshold enforced
• Multiple report formats: Terminal, HTML (htmlcov/), XML (coverage.xml)
• Source filtering to focus on application code
• Exclusion patterns for test files and boilerplate code

Custom Test Markers

• @pytest.mark.unit - For unit tests
• @pytest.mark.integration - For integration tests
• @pytest.mark.slow - For performance/slow tests

Validation Tests

• Created comprehensive validation suite (test_setup_validation.py)
• Tests infrastructure components:
  • Pytest functionality
  • Fixture availability
  • Project structure validation
  • Python import paths
  • Custom markers
  • Mocking capabilities
  • Environment isolation

How to Run Tests

Install Dependencies

poetry install

Run All Tests

poetry run test
# or
poetry run tests

Run Specific Test Types

# 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"

Run with Coverage

poetry run pytest --cov-report=html
# Then open htmlcov/index.html

Run Validation Tests

poetry run pytest tests/test_setup_validation.py -v

Validation Results

✅ All validation tests pass (10/10)
✅ Both test commands work (test and tests)
✅ Coverage reporting generates HTML and XML reports
✅ Custom markers function properly
✅ Shared fixtures available across test suite
✅ Environment isolation working

Next Steps

Developers can now:

1. Write unit tests in tests/unit/
2. Write integration tests in tests/integration/
3. Use shared fixtures from conftest.py
4. Run tests with poetry run test
5. Generate coverage reports automatically
6. Mark tests with custom markers for organized test execution

The testing infrastructure is now ready for immediate use!