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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 of the random test don't work, for instance:
returns 7 when between 1969 and 1972
Not the correct number of Fridays between 1969 and 1972 - Expected: 7, instead got: 8
I counted the end of month Fridays in such years and there are 8!!