Worked on reliability and testing improvements for the pentaho-kettle repository, focusing on backend development and unit testing using Java. Addressed a specific issue in the Formula Step by refining error handling when no formula is provided, replacing a failure-specific code with a more general one to prevent misleading results. Updated the associated unit tests to cover this scenario, thereby increasing regression safety and overall test coverage. These changes enhanced workflow reliability and reduced ambiguous error signals, supporting safer future modifications. Ensured all updates aligned with project standards and continuous integration requirements, contributing to the ongoing health of the codebase.