In April 2026, Andras Kertesz developed Quasar mock device support for the tenstorrent/tt-umd repository, enabling API testing workflows without requiring the Zebu emulator. He implemented this by introducing a fictional quasar_Q1.yaml configuration and updating C++ code in cluster_descriptor_types.hpp to support mock device loading and board type registration. These changes allowed the tt-metal API tests to run against a simulated environment, improving testability and reducing dependency on hardware emulation. Andras utilized C++ programming and YAML configuration skills to streamline the testing process, ultimately enabling faster QA cycles and more comprehensive coverage for API development within the project.