Update sudoku-dlx testing infrastructure to match node-dlx:
- Migrate tests to use Mocha with ES module loader
- Update test runner and related dev dependencies
- Ensure code coverage tools work with new setup
- Align test scripts and structure with node-dlx
This will ensure reliable, modern testing practices across both repositories.
Update sudoku-dlx testing infrastructure to match node-dlx:
This will ensure reliable, modern testing practices across both repositories.