What goes in a /corpus folder of a cpan module

I read through this thread http://www.perlmonks.org/?node_id=1009586 but found no mention of the /corpus folder. Funny though that Test::Kwalitee::Extra seems to look for it, (although it doesn't fail if the folder is not found). I found very few modules containing a /corpus folder and I am struggling to understand what goes in there. Maybe it should be added to the aforementioned thread but I can't post to it myself as its under perl meditation section.

In reply to What is the use of /corpus folder in a CPAN distribution by shantanu_bhadoria

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