I was getting this error:

Should fizzify a random positive integer (1~100) correctly
ReferenceError: fizzify is not defined
  at fizzbuzzRandom
  at Test.it
  at Test.describe
  
  at Object.<anonymous>

and I could not fiure out the answer. I even ended up deleteing my visible code test. (oops!) I still did not find a way to reset or bring back the original test code. BUT I did figure out that seeing the test code does not matter to the testing conditions.

To any coders who are in the same spot. You can still solve this problem: The hint is fizzify is not defined and you can enter this code in the solution window not the test case window.