I think it's ok now - haven't looked for details, but 4 random tests should be enough (perhaps next time it's better to use a loop for more tests and shorter code), so thanks for the work;-)

Hi chuckmag, that's the usual way to implement these final testcases. For solved katas you can see code examples if you click/look at "Show Kata Test Cases" (open a solved kata and you will see this "link" in the middle of the site). There you will find what others do and surely there are some examples with random tests too - probably it's the easiest way to find out what to do exactly;-)!