During August 2025, Marko Djuric enhanced the SDXL refiner testing suite in the tenstorrent/tt-metal repository, focusing on improving test coverage and reliability for production changes. He consolidated and expanded Python-based unit tests, introducing a parameterized conv2d refiner test and broadening group normalization test scenarios. By reverting grid dimension changes, he ensured input mask and weight/bias calculations remained consistent, which reduced flaky test results and accelerated validation in continuous integration workflows. Marko’s work demonstrated depth in software testing and test-driven development, resulting in a more robust and maintainable testing framework for data processing pipelines within the SDXL refiner.