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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 agree that this is still a problem.
@jamietre: Just fixed the symmetry issue, it's not fixed.
If the test cases are all static, then it is a trivial thing to write a function that just outputs the expected value directly without doing any processing. A.k.a cheating. For this reason there should always be a few randomized tests in addition to the static tests to check the edge cases. Also, freezing the math object is a good idea.