In many random tests, all my test rows match except for a few, e.g.

correct answer:
"'D...'" 9!  Xy14lmTDftz-
YtlLqmJ3Q!  "Gli9..."

my answer:
"'D...'" 9!  Xy14lmTDft-
zYtlLqmJ3Q!  "Gli9..."

In this example, the last letter of line (n) is shifted to the beginning of line (n+1) compared to the reference solution.

Can I assume that if "123\n4567" is a correct solution, then "1234\n567" is also a correct? Is there a rule to make the solution unique?

(python)
If a test is not passed, result is displayed twice:

1. nicely formatted: Expect/Actual
2. unformatted: Actual/Expected

Input text: 

Hi, I am some text and I need to be arranged.

Line length: 15

* Correct answer: 

Hi, I am some
text and I need
to be arranged.

* Answer returned: 

Hi, I am some 
text and I need 
to be arranged.
: 'Hi, I am some \ntext and I need \nto be arranged.' should equal 'Hi, I am some\ntext and I need\nto be arranged.'

Is it possible to display only 1)?

I want to see the EN DASH character in the text. To do this, I copy the dash character from the sample tests window and execute the following code in python:

import unicodedata
c = "—" # char copied from the sample tests window in browser
print(f"Unicode-Name: {unicodedata.name(c)}")

the python output is "Unicode-Name: EM DASH".
As I understand the description, an EN DASH was used in the text. Can someone please explain what I am misunderstanding?

Python:

passing all fixed test cases but no random test cases. Although it is probably because of my terribly-written, bug-riddled code, the random tests are impossible to debug. The strings are way too long, and it would be really helpful if there were some shorter random strings.

The test structure of both sample tests and actual tests need to be modified: it's calling user solution twice per test for no reasons.