During December 2025, contributed to the luoyuxia/fluss repository by developing Delta Join Integration Tests for Apache Flink, focusing on validating join operations and ensuring alignment with updated documentation. The work involved implementing comprehensive integration tests in Java and SQL, which improved test coverage and enhanced the reliability of Delta Join behavior within production data pipelines. By coordinating closely with documentation updates, the changes reduced risk and enabled faster regression detection. The approach emphasized test automation and Git-based collaboration, resulting in more robust validation processes and better documentation-test alignment, although no major bugs were addressed during this period of focused feature development.