During October 2025, Fess focused on enhancing DNS test reliability within the containers/gvisor-tap-vsock repository. They built an in-tree DNS testing infrastructure using Go and the go-mockdns library, refactoring existing tests to use a mock DNS resolver instead of relying on external DNS services. This approach improved test correctness and reduced flakiness by decoupling the suite from external dependencies. Fess also addressed DNS TXT record handling, ensuring long records were split properly and multiple records were treated as separate entries. Their work in Go and backend testing led to faster, more stable CI runs and clearer DNS resolution behavior in tests.