Worked on stabilizing the test suite for the facebook/folly repository, focusing on cross-ABI compatibility between libc++ and libstdc++. Addressed a series of test failures by refining test logic and aligning expectations for components such as F14Map, epoll_backend, not_null, and observer tests. The approach involved detailed debugging and low-level C++ programming to ensure consistent behavior regardless of the standard library implementation. Emphasized robust memory management and careful adjustment of allocator and destructor behaviors. The work resulted in a more reliable testing framework, allowing the suite to pass consistently across different build systems and C++ standard library environments.