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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.
Name of your method is different than the name of the method used in test cases. That's why you get an error.
Actually reading an error message really does help!