Worked on enhancing DNS test reliability and correctness within the containers/gvisor-tap-vsock repository by building an in-tree DNS testing infrastructure using Go and the go-mockdns library. Refactored existing DNS tests to utilize a mock resolver, which decoupled the test suite from external DNS dependencies and improved both speed and reliability. Addressed issues with DNS TXT record handling by ensuring long TXT records are split correctly and multiple TXT records are treated as separate entries. These backend development efforts resulted in more stable continuous integration, faster test execution, and clearer, more predictable DNS resolution behavior during automated testing workflows.