Worked on the Esri/harfbuzz repository to enhance test infrastructure and documentation, focusing on improving the reliability and maintainability of font rendering tests. Developed automated workflows in C for regenerating paint test outputs and updating font assets, ensuring alignment with the upstream color-fonts repository. Enhanced test utilities to support direct output generation when specific flags are set, and maintained test asset hygiene by cleaning outdated data and refining test expectations for clipping, glyphs, and gradients. Updated technical documentation to clarify serialization parsing, specifically addressing whitespace omission in feature and variation representations, thereby supporting more robust integration and easier downstream parsing.