/usr/share/texmf-texlive/metafont/misc/rtest.mf is in texlive-base 2009-15.
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 7 8 9 10 11 12 13 | % try all characters on TEST.MF using the parameters of cmr10
if unknown cmbase: input cmbase fi % omit if CMMF can be assumed
mode_setup;
def generate suffix t= enddef;
input cmr10; font_setup;
let echar=endchar;
def endchar= echar; stop "done with char "&decimal charcode&". " enddef;
let iff=always_iff;
input test;
end
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