Irene Yang developed a policy mocking facility for the microsoft/mu_basecore repository, focusing on enhancing test infrastructure for policy configuration scenarios. She implemented the SetPolicy function within MockPolicyLibCommon using C++, enabling tests to mock policy configurations and thereby improving the determinism and scalability of unit testing. Her work centered on C++ development, leveraging mocking and unit testing techniques to allow more robust validation of policy-related code paths. By expanding the test infrastructure in this way, Irene addressed the need for safer policy changes and reduced risk in future development, delivering a targeted feature with clear impact over a one-month period.