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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.
Some tests have expected result is that the first borrower has the longest_borrow_interval. Is this a bug? Since only the return date is known for the first borrower of any book, we can't calculate a borrow_interval for the first entry.
There is still the same issue with random tests: multiple trasactions for a product_id per day.