During February 2025, Xudong Jia developed foundational unit testing capabilities for the source-academy/modules repository, focusing on improving the reliability and maintainability of React components. He implemented a unit testing framework using JavaScript and TypeScript, introducing comprehensive test suites and assertions to ensure robust component behavior. Xudong also updated the ESLint configuration to better support React testing workflows, which reduced lint failures and streamlined onboarding for new contributors. His work enabled faster feedback cycles and higher code quality by integrating React Testing and ESLint into the development process. The depth of his contributions established a solid testing infrastructure for future enhancements.