Even the test is showing one return element

except that your output is supposed to be a two elements tuple... ;) So nothing wrong in the tests.

I'm getting some errors in the test code:

Traceback (most recent call last):
File "/runner/frameworks/python/cw-2.py", line 111, in wrapper
func()
File "main.py", line 10, in it_1
Test.assert_equals(encode("")[0], "")
IndexError: string index out of range

That index in the test assertion is causing issue. I run the test without it, seems to do just fine:

Test.assert_equals(encode(""), "")

I'm not sure if this is a bug or I need to approach this another way to remove the error and pass the assert?