Thanks for the Console.WriteLine() advice. I didn't know we could use it for logging here in CodeWars.

Kata is now completed (forgot one Console.WriteLine line at the beginning :))

Added that one to Example Test Cases.

You can actually use Console.WriteLine() to see print anything you want to console. This helps in debugging a lot.

The negative zero problem seems to be gone. But now I got a new error:

✔ 8 assertions passed
✘ Expected string length 14 but was 13. Strings differ at index 0.
Expected: "-195595/564071"
But was: "195595/564071"
-----------^

This input is not included in tests, therefore I can't reproduce it to see what the new problem is. Can you please add it?

Could you please try again?

Nice kata, that sign before zero was killing me ;).

The random tests are broken (Ruby):
Testing for mixed_fraction(973816/-835922)
It should work for random inputs too - Expected: "1 68947/417961", instead got: "-1 68947/417961"

Testing for mixed_fraction(-67347/602450)
It should work for random inputs too - Expected: "67347/602450", instead got: "-67347/602450"

also the sign problem for random inputs
Testing for mixed_fraction(474690/-834562)
✘ It should work for random inputs too - Expected: "237345/417281", instead got: "-237345/417281"
Testing for mixed_fraction(430664/-898557)
✘ It should work for random inputs too - Expected: "430664/898557", instead got: "-430664/898557"

✘ It should work for random inputs too
Expected string length 6 but was 3. Strings differ at index 0.
Expected: "-0 1/5"
But was: "1/5"
-----------^

Man, there's no such thing as a negative zero. Fix this please.