Kata

In the discription I was doing it in such a way that if all the numbers were the same frequency and none were more than the other then return null. should I do it differently?

I think

when the length of the input is not 1
    if there are no duplicate in the array
        then you've to return 'null'
    otherwise
        if multiple element have same max count
            return array consisting of all of them
        other
            return the number with max count

otherwise
  return the first element

I solved it by requiring the frequency of the mode having to be > 1. That doesn't make much sense.

The description is too long anyway. Simplify things ( a lot ), and take out any such logical inconsistencies. There is always a mode ( unless the input is [] ). ( Is that tested? No, it doesn't have a mean either. This should be specified. )

You fixed it wrong. Well, less than ideal.

If you're wrapping one block in describe, wrap all blocks in describe, or chai will reorder and format your tests in weird ways.

You can nest its in describes and describes in describes, but not describes in its or its in its. The outermost level of wrapping can be its ( if it's the only level ); the innermost level must be. There is no need to show the input in the header anyway ( people can debug print that themselves if they need to ), so use wrappers to group tests, not to show endless useless information. ( Other opinions may be available, but I favour a rather minimalistic look of test results. )

OK, realistically, this is going to be retired sooner rather than later.

Your next attempt at publishing a kata should really have less problems - preferably none at all - when you hit Publish. Read the docs; if you don't know something, ask for help before publishing ( docs say where ), and don't cut any corners. Also, pick an original subject for your kata. Or the next one will probably get retired again, which is good for no one.

I couldn't figure out how to get the random tests to work without that version. It's probably somthing really obvious, but I'm new to testing. I'm not sure i understand it. can you help me?

Yeah, let me finish the kata and I'll have a look.

Thank you!

You have to correctly wrap asserts in describes and its.

I think you only have to wrap in its in Node 12.x.

ATM, there are no random tests if you just choose Node 12.x in the drop-down. That's a problem. Fix that now.