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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 test does not work if English regional settings are not used.
English: assertEquals("5.000", String.format("%.3f", poly.circleDiameter()));
Non-English: assertEquals("5,000", String.format("%.3f", poly.circleDiameter()));
I think you should include the formula for this in the prompt since I wouldn't expect anyone to derive it from scratch for a 8 kyu kata.