During November 2024, Jtabibito enhanced the galacean/engine repository by expanding unit test coverage for the MeshRenderer component. Focusing on TypeScript and leveraging strong software testing and unit testing skills, Jtabibito developed comprehensive test scenarios to validate features such as receiveShadows, material handling for both single and multiple materials, material count, instance material retrieval, and priority settings. This work improved the reliability of the rendering subsystem, reducing the risk of regressions and enabling safer, faster refactoring. By applying test-driven development practices, Jtabibito contributed to higher code quality and maintainability within the rendering pipeline over the course of the month.