Worked on the mxsm/rocketmq-rust repository, focusing on enhancing reliability and maintainability through comprehensive unit testing. Developed and implemented tests for the CMResult enum within the rocketmq-remoting module, ensuring correct serialization, deserialization, integer conversions, and display formatting for the CR_SUCCESS variant. The approach included robust handling of unknown enum variants, which increases resilience and correctness in production environments. Leveraged Rust for both implementation and testing, with a strong emphasis on serialization and deserialization techniques. This work addressed issues #1190 and #1191, reducing future maintenance overhead and supporting safer refactoring by improving test coverage and safeguarding against edge cases.