Charlene Lyu focused on enhancing the test infrastructure for the xupefei/delta repository by refactoring the DeltaFormatSharingSourceSuite test suite. She reorganized and reformatted the Scala-based tests to improve readability and maintainability, ensuring that streaming capabilities continued to be thoroughly verified without altering the underlying test logic. Her work leveraged skills in Delta Lake, Spark, and rigorous testing practices, resulting in a cleaner codebase that reduces maintenance overhead and lowers the risk of regressions. This targeted refactor supports faster onboarding for new contributors and lays a foundation for more efficient future development within the Delta Lake project’s testing framework.