Worked on improving test reliability and resource management in the apache/flink repository by addressing issues in the PartitionedFile test suite. Focused on Java-based file management and unit testing, the work involved moving partitioned file handling to a class-wide scope and implementing cleanup routines using deleteQuietly() to ensure temporary files and resources were properly deallocated after each test. These changes, delivered across two traceable commits, reduced file handle leaks and disk space accumulation, directly stabilizing continuous integration runs. The improvements enhanced test hygiene, maintained coverage, and lowered maintenance costs, demonstrating a methodical approach to resource management and Java development best practices.