Worked on the videolan/meson repository to enhance the reliability of the test suite during high-parallelism CI runs. Addressed a race condition by isolating the '17 prebuilt shared' test directory, copying it to a temporary location for each test execution. This approach prevented shared data mutation and eliminated shutil.Error occurrences, resulting in more stable and predictable test outcomes. The work involved debugging concurrency issues, implementing filesystem isolation, and hardening the test harness to support robust parallel execution. Utilized Python and CI/CD practices with a focus on automated testing, contributing to improved maintainability and reliability of the meson project’s test infrastructure.