Worked on the apache/spark repository to enhance the reliability of the PySpark non-daemon worker path by addressing socket lifecycle issues through targeted testing. Developed and implemented SimpleWorkerTests in Python, specifically within the test_worker.py suite, to ensure robust coverage of scenarios that previously led to EOFException during process exit. Focused on improving test coverage rather than introducing user-facing features, the work involved setting configuration flags to exercise the non-daemon path and validating the system’s behavior under these conditions. This tests-only contribution supports safe backports across branches and demonstrates a methodical approach to software development and testing in Python environments.