Worked on enhancing the reliability of the Tiktoken tokenizer within the bytedance-iaas/sglang repository by developing targeted unit tests in Python. Focused on verifying the correct handling of reserved and control tokens, the work validated both TiktokenProcessor and TiktokenTokenizer behaviors to ensure robust tokenization. Emphasized software testing and tokenization best practices, expanding test coverage to reduce production risk and support safer downstream integrations. The approach contributed to stronger continuous integration signals and minimized the likelihood of tokenizer regressions. This effort improved the maintainability and reliability of the codebase, supporting ongoing development and integration efforts within the project.