FEET: A Framework for End-to-End Testability of FreeRADIUS via Containerization and CI Pipelines

This paper introduces FEET, a comprehensive testing framework designed to streamline FreeRADIUS deployments through containerization and automation. By integrating Docker-in-Docker and Docker Network technologies within GitLab CI pipelines, FEET enables precise simulation of realistic client-server authentication scenarios. Continuous static code analysis through SonarQube further ensures robust software quality. Experimental evaluations demonstrate significant performance improvements, including up to $50 \%$ higher throughput under high concurrency compared to traditional bare-metal setups. Ultimately, FEET provides a scalable, secure, and easily replicable model for infrastructure-as-code in authentication services.