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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.
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All the manager-related stuff in this kata is noise which adds absolutely nothing to the task, and it really should be removed. (If somebody decides to rework the kata this way, it'd be nice if the tables' and columns' names were changed to be more appropriate than they are now).
I'm opening this a
suggestion
but it's more of anissue
IMO.numeric
should be used for money calculations.Sample tests should have fixed data and proper test cases.