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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.
Random tests added.
About duplicate, I'm not found same in suggested..
It pointed to test most basics of values manipulation, and I think special cases of JS typing will be not relvant here. Also, it may violate initial description. But this is a great point for advanced version of this kata.
Test title fixed, thank you.