Mahdi Mirzaei focused on enhancing the test infrastructure for the vitruv-tools/Vitruv repository by refactoring the integration test utilities package. He reorganized the Java codebase to align test utility packaging with the integration testing scope, renaming the relevant package to clarify its purpose. This non-functional change improved the maintainability and clarity of the integration test suite, supporting faster onboarding for new engineers and more reliable continuous integration feedback. By leveraging his skills in refactoring and Java, Mahdi established a clearer structure for test ownership, laying a stronger foundation for future integration tests without introducing user-facing features or bug fixes.