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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.
As student003 replied, this is due to a bug in exception handling. This bug has been fixed now, which results in the Test cases to run as intented.
It seems that broken codes which raise exception doesn't fail these tests.