See libxtrans commit
0794b1b712a90b40e2b019c9edc6f96874493c52. The code
to generate this socket was removed 5 years ago and even before it was
conditional on #define TEST_t. There is no reference to that #define in
either the X server nor libX11's git history, or in any of the current
libX*.
Let's assume this is well and truly obsolete.
D! /tmp/.ICE-unix 1777 root root 10d
D! /tmp/.XIM-unix 1777 root root 10d
D! /tmp/.font-unix 1777 root root 10d
-D! /tmp/.Test-unix 1777 root root 10d
# Unlink the X11 lock files
r! /tmp/.X[0-9]*-lock