Belina focused on enhancing test reliability for the PartitionReducer component in the OpenLiberty/open-liberty repository. She addressed a recurring issue where tests would fail unpredictably due to multiple exception types and ordering inconsistencies during multi-failure scenarios. By refining the test logic to robustly handle both BatchContainerRuntimeException and IllegalStateException, Belina reduced the likelihood of flaky test outcomes and improved the accuracy of failure detection. Her work leveraged Java, with an emphasis on exception handling and unit testing, resulting in more stable continuous integration runs. This targeted bug fix demonstrated careful attention to edge cases and contributed to overall codebase stability.