Contributed to the ping1jing2/sglang repository by enhancing the reliability and test coverage of the SGLang SRT Constrained module. Developed comprehensive unit tests targeting the grammar backend, grammar manager, and utility functions, with a focus on verifying grammar processing, caching mechanisms, and error handling. Leveraged Python for backend development and software testing, applying unit testing methodologies to ensure correctness and regression safety. The work addressed reliability concerns by systematically expanding test coverage, supporting maintainability and robustness of the constrained module. This approach provided a solid foundation for future development and reduced the risk of undetected issues in grammar-related functionality.