During September 2025, Mathieu Labourier enhanced the reliability of storage coalescing tests in the xcp-ng/xcp-ng-tests repository. He focused on improving test determinism and CI stability by ensuring the xxd utility was present on all test hosts and by extending operation timeouts for coalesce processes. Mathieu introduced a Python-based fixture that automatically restarts the toolstack after yum state changes, addressing cross-host inconsistencies in the SM-list and supporting smoother storage resource enable and disable cycles. Leveraging his skills in DevOps, system administration, and test automation, Mathieu delivered targeted improvements that reduced flaky test behavior and improved overall workflow consistency.