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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.
not an issue, a question ;) (issues are for a dysfunctionning kata, or wrong tests, ...)
My bet: check for extra line feed or space (or wahtever could become invisible when printed) at the end of your output.
Otherwise, paste here a full assertion message (expected/actual)