How do you test async code with this?

It becomes draft and will disappear from the kata list when you unpublish it.
You can still share the link and everyone can access to it using it.
Can still test with the complete tests but not able to submit the final answer. (AFAIK)

(1) Why would you want that? Everybody likes a challenge! :]
(2) Unpublish it. Anybody with the link can still access it, but it won't show up for everybody.

What I meant is, I created it primarily as a small challenge for my colleagues, it was not my intention for this to be used publicly. Maybe if it waas only accessible by a link or smth.. It doesn't matter too much I guess

You can simply un-publish it, and re-publish when everything is done.

My bad, forgot to add test cases to example cases. Is there a way to make a kata private though?

• In Sample Tests. assert.typeOf(SimplePromise, 'function') is not correct and gives no useful infomation for coding
• Solutions like this should not pass the tests

It just creates a copy of an array, so that actual argument is not mutated. n could be ommited here, without change, making this less confusing.