Implements a complete test infrastructure with 14 unit tests achieving 100% coverage on main.py, integrated with GitHub Actions for automated cross-platform testing.

Test Suite

• Coverage: All functions in main.py (openLicense, openEULA, ProgramVer, get_resource_path)
• Mocking strategy: Uses unittest.mock to test GUI components without requiring display
• Test organization: 4 test classes covering unit and integration scenarios

Code Improvements

• Added get_resource_path() helper for absolute file path resolution
• Replaced hardcoded relative paths with dynamic absolute paths
• Removed redundant file.close() calls (already handled by context manager)

# Before
with open("LICENSE.txt", "r", encoding="UTF-8") as licensefile:
    licensecontents = licensefile.read()
licensefile.close()  # Redundant

# After
license_path = get_resource_path("LICENSE.txt")
with open(license_path, "r", encoding="UTF-8") as licensefile:
    licensecontents = licensefile.read()

CI/CD Integration

• Platforms: Ubuntu, Windows, macOS
• Python versions: 3.9, 3.10, 3.11, 3.12
• Features: Headless GUI testing (xvfb), coverage reporting to Codecov

Configuration

• pytest.ini: Test discovery and execution settings
• requirements.txt: Added pytest>=7.4.0, pytest-cov>=4.1.0
• .github/workflows/tests.yml: Multi-platform test matrix with conditional requirements installation

Documentation

• tests/README.md: Complete guide for running tests locally and in CI
• Main README: Testing section with badge and usage examples

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