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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.
Agree. A bit confusing description
That easy?
UPD
See what you meant
I can implement and run the function locally but in this kata keep receiving an error saying "spy.callCount" is not a function. I do understand that the problem is actually in the tests, but what I am to do with it?