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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
It seems your cuckoos are one cuckoo short. I just solved the kata in Scala nad encountered no problems with it.
I am going to close this one as not a kata issue, because tests seem to be correct. If you have any doubts, post your code or ask for help on Codewars Discord.