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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.
Description lacks the requirement of function being callable without params though. This needs to be added, just sample test is not enough.
Tests are fine, problem is with your code.