/usr/share/denemo/actions/testinclude.ly is in denemo-data 2.0.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | MvmntIVoiceI = {
r4 cis a a a a a
a'4 bes'8.( c''16 d''2) \bar "|."}
|