Elvis Yang developed unit-test mocks for LocalApicLib within the microsoft/mu_basecore repository, focusing on enhancing testability and code safety. By implementing MockLocalApicLib.h and MockLocalApicLib.cpp, Elvis enabled isolated unit testing of low-level C++ code without modifying production logic or introducing breaking changes. The approach leveraged mocking frameworks and test-double design patterns to allow developers to validate code paths independently, resulting in faster CI feedback and improved regression protection. Although no bugs were fixed during this period, the work demonstrated depth in low-level programming and unit testing, providing a robust foundation for future refactoring and maintenance efforts.