New comment by newbluemoon on void-packages repository

https://github.com/void-linux/void-packages/pull/27849#issuecomment-763356357

Comment:
Maybe the test fails because of some parallelism issue. The test runs multiple instances of lilypond to create some output files which are then compared to a baseline; maybe a check is run before an output file is created. I can try to disable parallelism for checking with the next update.

However, the intention of the test is to compare changes a developer made against a release version; i.e. a baseline is created regarding the release and the test checks if/how the developer’s changes deviate from that baseline.
So other than checking that lilypond runs correctly the test here is of not much use, because the baseline and what is checked against it is the same, apparently. ;)