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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.
Test cases check if your method return proper value, so you should add proper keyword :)
As far as I know you can define multiple classes in one file as long as only one of them is public (although it's very messy).