/usr/share/sounds/moblin/stereo/audio-test-signal.ogg is in moblin-sound-theme 0.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/sounds/moblin/stereo/desktop-login.ogg
/usr/share/sounds/moblin/stereo/desktop-login.ogg