Worked on enhancing test stability for the mybatis-dynamic-sql repository by addressing flakiness in JoinMapper-related tests. Focused on improving the reliability of automated testing by replacing order-dependent assertions with order-insensitive ones, ensuring that test outcomes no longer varied due to row ordering. This approach reduced continuous integration noise and provided faster, more reliable feedback on changes to join-path logic, without altering production behavior. Utilized Kotlin for both test automation and unit testing, applying best practices in test design to achieve deterministic results. The work contributed to a more robust testing pipeline and improved traceability for future maintenance efforts.