Worked on expanding unit test coverage for the RaftVoterEndpoint class in the apache/kafka repository, focusing on backend development with Java and unit testing. The contribution targeted reliability by validating object behavior under a range of edge-case inputs, including null, whitespace, empty, and non-uppercase listener values, as well as IPv6 host handling. Tests were added for accessor methods, equality, hashCode, and toString, ensuring correct object semantics and robustness. This work improved code stability and reduced regression risk by thoroughly exercising critical logic paths, ultimately enhancing maintainability and developer confidence in the RaftVoterEndpoint component of the Kafka project.