Worked on the adoptium/aqa-tests repository to enhance test reliability and maintainability across Java runtimes. Addressed localization test failures by updating the TWTagTest to handle changes in time zone display names introduced in JDK 24 and above, using Java and XML to implement version-gated logic for accurate localization validation. Additionally, improved jtreg-based OpenJDK testing on OS/390 by introducing a Makefile-driven enhancement that exports the LIBPATH environment variable, ensuring stable native library path configuration. These contributions focused on reducing CI noise, supporting cross-version compatibility, and strengthening test infrastructure through targeted updates in localization handling and build automation.