Thanks!

You can check some other kata you've already solved to see how they're written in your language of choice, simply click on Test Cases.

Here is the official documentation on writing Random Tests.

Oh, i'm new to creating katas, can you please explain how to make random tests?

Those aren't random tests, random tests have input generated on the fly. What you have there are 7 fixed tests.

There are random tests what do you mean?

too late; that's the lowest score I've ever witnessed .. o_0

-13% of 4