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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.
No random tests.
Duplicate:
https://www.codewars.com/kata/5596f6e9529e9ab6fb000014/discuss
https://www.codewars.com/kata/55467aaf72494e3bdc00007f/discuss
I'm not entirely sure but this could be a duplicate. Not raising an issue for now, maybe more people will remember doing a similar kata as well, and mark it as a duplicate instead.