Developer Builds Automated Pentest Suite to Stress-Test His Own macOS Security App

Tetsuharu, developer of the macOS network-security app RoamSwitch, created an automated penetration testing suite to check whether new code updates introduced security regressions. Rather than risk destabilizing his primary machine, he used Tart, a lightweight macOS virtualization tool, to run tests inside a disposable macOS Sonoma virtual machine. The suite probed five defense boundaries, including XPC authorization, packet filter rules, port exposure detection, and ARP gateway consistency. Key results confirmed that the privileged root helper correctly rejected unauthorized XPC callers, the Air-Gap firewall rules enforced a fail-closed policy, and globally exposed ports were detected and shielded as expected. The approach offers a repeatable, low-risk method for security regression testing across app releases.