Worked on stabilizing the test suite for the canonical/snapd repository by addressing file permission inconsistencies in Go-based tests. Focused on correcting the handling of os.FileMode values, specifically standardizing permission checks to use the octal value 0755. This adjustment resolved errors caused by non-octal representations, leading to more reliable and predictable test outcomes across different environments. The work involved troubleshooting the test harness and improving the clarity of permission semantics, which in turn reduced CI flakiness related to file permissions. Demonstrated skills in Go, file permissions, and automated testing, contributing to a more robust and maintainable testing framework.