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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.
The issue is, when I throw an exception from the intProgress method, the tests don't have the exception in their signatures, so the exception is treated like an uncaught exception.