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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.
Suggestion
Since the kata is available in Ruby, the tests should work in Ruby.
At least the initial tests yield a syntaxt error.
Interestingly the 'final' tests are working fine.
The 3 provided test case has some syntax errrors, throwing an error when you try to run it. I'm still figuring out Ruby, so I'm not really sure what they are.
Could use more user-visible test cases.