I'm working on some stuff, which will have the data of the user.

What's that supposed to mean? That you cannot finish your kata right now? In that case, just don't publish the kata. An unfinished kata has close to no chances to survive it's first day in beta.

Did you already read the documentation about authoring, btw?

Hi,

• not enough sample tests (missing some where the ordering of the input isn't "correct"to begin with)
• it's not specified that the input won't always be sorted, while that's what the examples suggest
• no random tests
• the inputs aren't described and do not really make sense, so far: why an array of objects? => an array of strings would be much simpler
• the edge cases about null and empty array aren't useful: you could just drop them. At the very least, the null one (note: it's not justifiable to even keep the null case if you don't test for undefined as well)

Cheers