Zhiyi Hu developed a comprehensive unit test suite for the Sky class in the godotengine/godot repository, focusing on enhancing the reliability of rendering components. Leveraging C++ and test-driven development practices, Zhiyi validated radiance size handling, process mode behavior, and resilience to edge cases such as invalid inputs and null materials. This targeted effort improved the maintainability of the codebase by enabling earlier detection of regressions and reducing future debugging time. By expanding test coverage in a core area of the rendering pipeline, Zhiyi’s work laid a foundation for more robust feature development and streamlined quality assurance in game development workflows.