feat: Add comprehensive Python testing infrastructure with Poetry

[llbbl]

Add Python Testing Infrastructure

Summary

This PR sets up a complete testing infrastructure for the All Autocomplete Sublime Text plugin using Poetry as the package manager and pytest as the testing framework.

Changes Made

Package Management

• Poetry Setup: Created pyproject.toml with Poetry configuration
• No Migration Needed: No existing requirements.txt or setup.py files were found

Testing Dependencies

Added as development dependencies:

• pytest ^8.0.0 - Core testing framework
• pytest-cov ^5.0.0 - Coverage reporting
• pytest-mock ^3.14.0 - Mocking utilities

Testing Configuration

Configured in pyproject.toml:

• pytest settings:

  • Test discovery patterns for test_*.py and *_test.py
  • Coverage threshold set to 80%
  • HTML and XML coverage reports
  • Custom markers: unit, integration, slow
  • Strict mode enabled for markers and configuration

• coverage settings:

  • Source includes all_views_completions.py
  • Excludes test files, cache, and virtual environments
  • Branch coverage enabled
  • Multiple report formats (terminal, HTML, XML)

Directory Structure

tests/
├── __init__.py
├── conftest.py          # Shared fixtures for Sublime Text mocking
├── test_infrastructure.py  # Validation tests
├── unit/
│   ├── __init__.py
│   └── test_example.py  # Example test demonstrating usage
└── integration/
    └── __init__.py

Test Fixtures

Created comprehensive fixtures in conftest.py:

• mock_sublime - Mocks the sublime module
• mock_sublime_plugin - Mocks the sublime_plugin module
• temp_dir - Temporary directory for test files
• mock_settings - Mock Sublime Text settings
• mock_view - Mock Sublime Text view object
• mock_window - Mock Sublime Text window object
• sample_completions - Sample completion data
• plugin_settings_file - Temporary settings file
• mock_region - Mock Region object
• reset_modules - Auto-cleanup fixture

Development Commands

Configured Poetry scripts:

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

Additional Setup

• Updated .gitignore with:
  • Python artifacts (__pycache__/, *.pyc, etc.)
  • Testing artifacts (.pytest_cache/, .coverage, htmlcov/, coverage.xml)
  • Claude settings (.claude/*)
  • Virtual environments and IDE files
  • Note: poetry.lock is 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

3. Run tests:

   # Run all tests with coverage
   poetry run test
   
   # Run specific test file
   poetry run test tests/unit/test_example.py
   
   # Run tests without coverage
   poetry run test --no-cov
   
   # Run tests with specific markers
   poetry run test -m unit
   poetry run test -m "not slow"

4. View coverage reports:

   • Terminal: Shown automatically after test run
   • HTML: Open htmlcov/index.html in browser
   • XML: Available at coverage.xml for CI integration

Validation

The infrastructure has been validated with:

• All dependencies properly installed
• Test discovery working correctly
• Coverage reporting functional
• Custom markers configured
• Example tests passing
• Both test and tests commands working

Notes

• The 80% coverage threshold is configured but won't be enforced until actual tests are written
• The example test in tests/unit/test_example.py demonstrates how to properly mock Sublime Text APIs
• The infrastructure is ready for immediate test development
• No actual unit tests for the plugin code were written (as requested)