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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.
Needs random tests
Tests need to provide information on inputs and expected outputs.
Totally unclear what it's meant to do for non-
Stringelements.The idea is good, but I think you should specify that all elements in the returned Array have to be Strings.
Also the message you get on a failed test doesn't say why it failed, so I had to resort to some metaprogramming to see what exactly you're testing.