This is xnu-8019. See this file in:
Directory listing for xnu-8019//tests/launchd_plists
com.apple.xnu.test.kevent_qos.plist
com.apple.xnu.test.mach_port.plist
com.apple.xnu.test.task_create_suid_cred.plist
com.apple.xnu.test.turnstile_multihop.plist