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• No random tests in JS

• Node 12 should be enabled (Refer this and this for more info)

• No random tests in ruby

I agree with what was already said. It needs to be clear in the description that it loops back to 11 when goin below 0 and back to 0 when it goes above 11. I would also suggest making this kata a little more interesting by including double flats and double sharps. It would just be something more to add that could make it the slightest bit more challenging. For instance, then, you would have to differentiate between there being only one 'b' or there being two 'bb' (single versus double flat.) For sharps, a single sharp would still be '#'; however, a double sharp would be represented by an 'x', or two sharp signs, but I would reccomend an 'x' to make it more interesting. Look up a double sharp sign if you don't know what it looks like - an 'x' most accurately represents it. Sorry for rambling, but I hope you take my suggestions into consideration.

It needs to be more clear in the Description that 11 is the highest number and it cycles. 11 -> 0. This is not demonstrated in the tests or described in the Description.