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Needs random test cases
Needs more tests.
"Jon has a string but its where the spaces (' ') should be there are commas (,)."
This is phrased confusingly.
Description is not written well.
more test cases with different input types (e.g. not a string) are required
You might want to change the wording of the problem.
Jon has a string but where there should be spaces (' ') there are commas (,).
Replace commas with spaces.
Seems quite a duplicate of other katas. Furthermore only two fixed tests and no random tests.
I feel that this is repeated (not exact same kata but very similar) and way too easy.
It is missing edge tests and random tests. Not to mention it has only two tests which is pretty bad. Not only bad practice but also bad for the site where it could allow cheating.
It only has two tests. It would be nice to add several more tests.
You also should include random tests to prevent cheating.
Pretty much a duplicate:
http://www.codewars.com/kata/dna-to-rna-conversion
http://www.codewars.com/kata/javascript-seems-to-be-broken
and several "remove vowels" katas too.