[Python] Unit testing for code isn't working for cs50 problem

I'm currently working on a Cs50 problem called Testing my Twitter. The code works very well and has no problems. But I'm having trouble trying to run a unit test on it.

this is my regular code that needs testing:

def shorten(word):
tweet = input("Input: ")
for letter in tweet:
if not letter in ['A','E','I','O','U','a','e','i','o']:
return letter
print()


And this is my unit test code:

import twttr

def test_twttr():
assert shorten('Hello') == 'Hll'
test_twttr()


I've run into a lot of errors and have reached this point in my code where it just says OK. I changed my code to have an error and I'm still getting the same message. Can someone please take a look and see what's going on?

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