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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.
Yes, the tests are aren't printing the tested values and expected results. The most likely problem is rounding. I'll try and get the tests fixed so they print out what they are expecting. I'll see if I can add some random tests as well. Thanks.