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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.
There appears to be an issue in the runtime that causes code that should work as a solution to not work. I don't think this is an issue with the Kata itself, since the code that should work does behave as expected when run on the in-browser environment of CoffeeScript.org.
The last test case was missing it's closing paren.