feat: Set up complete Python testing infrastructure with Poetry

[llbbl]

Set Up Python Testing Infrastructure

Summary

This PR establishes a complete testing infrastructure for the Python newsletter automation project using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Configuration: Created pyproject.toml with Poetry configuration
• Dependencies: Migrated existing dependencies (crewai, langchain, praw, etc.) to Poetry
• Python Version: Set to Python 3.9+ for compatibility with all dependencies
• Lock File: Generated poetry.lock for reproducible builds

Testing Setup

• Testing Framework: Added pytest with extensions:
  • pytest-cov for code coverage reporting
  • pytest-mock for mocking utilities
• Configuration: Comprehensive pytest configuration including:
  • Test discovery patterns
  • Coverage settings with 80% threshold
  • HTML and XML coverage reports
  • Custom test markers (unit, integration, slow)
  • Strict mode for better error reporting

Directory Structure

tests/
├── __init__.py
├── conftest.py          # Shared fixtures and configuration
├── unit/                # Unit tests directory
│   └── __init__.py
├── integration/         # Integration tests directory
│   └── __init__.py
└── test_infrastructure_validation.py  # Validation tests

Shared Fixtures (conftest.py)

• temp_dir: Temporary directory for test files
• mock_env_vars: Mock environment variables
• mock_config: Mock configuration dictionary
• mock_langchain_llm: Mock LangChain LLM
• mock_crewai_agent: Mock CrewAI Agent
• mock_crewai_task: Mock CrewAI Task
• mock_reddit_client: Mock Reddit (PRAW) client
• sample_newsletter_data: Sample data for testing
• capture_logs: Log capture fixture

Commands

• poetry run test - Run all tests with coverage
• poetry run tests - Alternative command (both work)
• poetry run pytest - Direct pytest execution

Additional Configuration

• Updated .gitignore with testing artifacts and Poetry files
• Added validation tests to ensure infrastructure works correctly
• Configured coverage to exclude test files from coverage calculation

Testing Instructions

1. Install Poetry if not already installed:

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

2. Install dependencies:

   poetry install

3. Run tests:

   poetry run test
   # or
   poetry run tests

4. View coverage report:

   • Terminal: Coverage is shown after test run
   • HTML: Open htmlcov/index.html in a browser
   • XML: Available at coverage.xml for CI/CD integration

Notes

• All validation tests pass successfully
• The infrastructure is ready for developers to write actual unit and integration tests
• Coverage threshold is set to 80% but currently excludes source files (only infrastructure is tested)
• Both test and tests commands are available as requested
• The setup follows Python testing best practices and modern tooling standards