In February 2025, Zhu Huazhi enhanced the aws/amazon-vpc-cni-k8s repository by implementing robust gRPC client mocking using Go. Focusing on the gRPC client path, Zhu refactored the unit tests and mocking framework to utilize DialContext, which improved test determinism and reduced flakiness. By ensuring the mock RPC client was instantiated exactly once, Zhu addressed issues with duplicate connections and unreliable tests. This targeted feature work strengthened the accuracy and reliability of the unit tests, supporting safer future refactors. The project demonstrated Zhu’s expertise in Go, mocking, and unit testing, delivering a maintainable solution for gRPC integration testing.