Worked on enhancing the galacean/engine repository by expanding unit test coverage for the MeshRenderer component, focusing on critical rendering features such as receiveShadows, material handling for both single and multiple materials, material count, instance material retrieval, and priority settings. Applied a test-driven development approach using TypeScript and software testing best practices to validate these scenarios, ensuring that the MeshRenderer’s properties and methods functioned correctly under various conditions. This effort improved the reliability and maintainability of the rendering subsystem, reduced the risk of regressions, and enabled safer, faster iterations for future development within the rendering pipeline.