Kata

There is also a fn === fn should not throw error.

That was accounted for as well. fn === fn and var a = fn; a === fn both return true. Only the first test case fn > 1 is showing up red, so it would seem it has to do with the comparison.

Oh, in that case you're probably using the wrong method.

There are two methods that are relevant to the kata, and one of them is slightly more obscure.

I don't think that's it either. I checked with both methods: the obvious one (already given in the testing feedback) and the slightly less obvious one. Hmm...funny kata.

Did you figure this out, in the end?

The average was 5kyu, so I ranked it as so.

(I even voted 7kyu before approving it, but then in the end, I rank katas based on the average rank when approving them.)

I'm not sure what you mean?

Not sure what you mean?

When you write your own test cases while solving a kata, there is a comment describing how to use Test.assertEquals, Test.expect, etc. But there is nothing about how to test if something throws an exception or not.

Since this kata is all about that, I thought that adding a provided test case that uses Test.expectError could teach people how to do that. :-)

Oh right. I don't actually write those comments, by the way. The system does it automatically if there aren't any example test cases. I've pasted in the default comment and added a couple of lines about expectError and expectNoError. Thanks for the feedback.