/usr/share/X11/xkb/semantics/xtest is in xkb-data 2.5-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | default xkb_semantics "xtest" {
xkb_types { include "basic" };
xkb_compatibility { include "xtest" };
};
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