Worked on the feldera/feldera repository to improve the reliability and correctness of automated testing. Addressed a critical issue in the distinct_count_test by fixing the partial_shuffle implementation, ensuring that elements are properly shuffled before counting distinct values. This adjustment reduced test flakiness and increased confidence in the release process by making test outcomes more consistent. The work involved careful debugging and validation using Rust, with a focus on robust testing practices. All changes were tracked with a signed-off commit to maintain traceability. The contribution demonstrates attention to detail and a methodical approach to improving code quality in Rust-based projects.