Worked on enhancing the test infrastructure for the au-ts/lionsos repository, focusing on improving the reliability of POSIX system tests. Addressed a recurring issue in the posix_test Makefile by removing a faulty argument from the QEMU command invocation, which previously caused unstable and flaky test runs. This targeted fix led to more consistent test outcomes and reduced noise in continuous integration pipelines, supporting faster and more dependable feedback cycles. The work emphasized maintainability and clear code ownership within the test harness, utilizing Makefile scripting, QEMU, and system testing skills to deliver a robust solution without introducing new features during the period.