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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.
I can't change the tests anymore since more than 500 CW passed the kata.
Well spotted.
Change the condition in the first line to v1 >= v2 and it's ok again.
The kata author should have provided a test case for this, but it seems they did not, and the random test cases are generated in such a way that it never happens that v2 > v1.
Are you modifying the input? You shouldn't do that.