Dean refactored the test formatting for the Cairo language server in the software-mansion/cairols repository, focusing on improving readability and consistency in macro expansions and struct definitions. By standardizing line breaks and comma placement, Dean enhanced the maintainability of the test suite and reduced future formatting-related churn. The work aligned test formatting with CI standards, making it easier to extend tests and ensuring more reliable continuous integration. Using Rust and leveraging skills in code formatting, the Language Server Protocol, and testing, Dean’s contributions provided a solid foundation for future development, though the scope was limited to a single feature over one month.