:(

If the tests time out they are anything but fine!
Even a simple function like the following doesn't complete in the alotted 12 seconds...

function smaller(arr) {
  console.log(arr);
  return arr;
}

So anyone trying the kata can't even debug the tests.

Hi
The test cases are fine, they are all good. They timeout because they are very stringent and huge.

Marking as resolved

I've worked out that if you run your solution against a test via the 'Run Tests' button it will save your current solution. It's a way to save progress manually that encourages Test-Driven Development :)

This relies on the type coercion. If you have use '===' it doesn't work unless you explicitly convert the result of add to a Number.

I'm having the same problem.
I also found a bug in another kata.
Always to do with recursion - probably BabelJS at fault.
It's starting to become a problem.