Goal is to test twttr.py with test_twttr.py twttr.py: def main(): user = str(input("Input: ")) print(shorten(user)) def shorten(word): word = str(word) result = '' vowels = ['a', 'e', 'i', 'o', 'u'] for letter in word: if letter.lower() not in vowels: result += letter return result if __name__ == "__main__": main() test_twttr.py: from twttr import shorten def test_default(): assert shorten("") == "" def test_uCase(): assert shorten("twITter") == "twTtr" def test_lCase(): assert shorten("TWitTER") == "TWtTR" def test_int(): assert shorten(0) == "0" assert shorten(452) == "452" assert shorten("21") == "21" def test_float(): assert shorten(3.14) == "3.14" assert shorten("2.71e") == "2.71" def test_punc(): assert shorten("..,-!?ab:i") == "..,-!?b:" Getting this error with check50 even though all tests passed in pytest: test_twttr.py exist correct twttr.py passes all test_twttr checks expected exit code 0, not 1 :| test_twttr catches twttr.py without vowel replacement can't check until a frown turns upside down :| test_twttr catches twttr.py without capitalized vowel replacement can't check until a frown turns upside down :| test_twttr catches twttr.py without lowercase vowel replacement can't check until a frown turns upside down :| test_twttr catches twttr.py omitting numbers can't check until a frown turns upside down :| test_twttr catches twttr.py printing in uppercase can't check until a frown turns upside down :| test_twttr catches twttr.py omitting punctuation can't check until a frown turns upside down When self checking code with pytest all tests pass but when check50 uses pytest it returns exit code 1. My guess is that this is due to check50 having its own "correct" version of twttr.py on which it uses my test_twttr.py. Continue reading...