One of the tests seems to expect that if number of positives == 0 and sumOfNegatives == 0 we should return an empty array. That was nowhere in the description and I had to guess that that is what the test wants. Would be nice if you could update description that this is expected.

This explanation from njxue should be added to the description of the kata - the actual description of the Kata is confusing. Thanks nxjue!

One of the tests is:

assert.strictEqual(
  convertFrac([[1, 2], [4, 5], [3, 4], [6, 9], [7, 10]]),
  "(30,60)(48,60)(45,60)(40,60)(42,60)"
);

But 60 is not divisible by 9 so the answer should be (90,180)(144,180)(135,180)(120,180)(126,180)

same issue, even though iam outputting with to_char