Worked on stabilizing the test infrastructure for proc macro server environments in the cairols repository, focusing on improving diagnostic reporting within complex testing scenarios. Addressed a core issue by updating the import of the test plugin suite, which resolved conflicts and ensured that diagnostics related to proc macros were accurately reported. This targeted bug fix enhanced the reliability and accuracy of the test suite, supporting faster and more trustworthy feedback in continuous integration pipelines. The work was implemented using Rust and leveraged expertise in the Language Server Protocol and testing methodologies, contributing to more robust and maintainable test environments for the project.