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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.
Right, I didn't pay attention at the test cases (or lack of test cases actually). I've submitted by solution and it worked ;)
I have a solution working in the console (of a browser), but when I click "Run tests" inside codewars all I get is a an helpful "Test didn't pass: Unknown error". Is the server running tests down at the moment?