During October 2024, Grt focused on enhancing Windows build system support in the denoland/chromium_build repository by enabling test-specific configurations. Grt implemented propagation of testonly flags from MIDL templates through to generated IDL actions and source sets, allowing test-only targets to be defined with minimal changes to existing build files. This approach streamlined the management of test builds, reduced manual configuration, and improved the reliability of test pipelines. Working primarily with GNI and leveraging expertise in build system configuration and Windows development, Grt established a scalable foundation for future test-oriented features, addressing maintenance overhead and mitigating potential misconfigurations in the process.