/usr/share/lilypond/2.14.2/fonts/source/feta-noteheads-test-generic.mf is in lilypond-data 2.14.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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% test stuff.
% in a separate file to avoid tainting non-test font files for testing.
%
input feta-noteheads;
%input feta-flags;
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