how to understand that i have passed 5 tests, but exit cod = 1

There're more than 5 tests. Your solution is wrong, not an issue.

Not a kata issue, the answer is wrong:

Testing:
Alexis:Wahl;John:Bell;Victoria:Schwarz;Abba:Dorny;Grace:Meta;Ann:Arno;Madison:STAN;Alex:Cornwell;Lewis:Kern;Megan:Stan;Alex:Korn
ACTUAL = (ARNO, ANN)(BELL, JOHN)(DORNY, ABBA)(KERN, LEWIS)(KORN, ALEX)(META, GRACE)(SCHWARZ, VICTORIA)(STAN, MEGAN)(WAHL, ALEXIS)
EXPECT = (ARNO, ANN)(BELL, JOHN)(CORNWELL, ALEX)(DORNY, ABBA)(KERN, LEWIS)(KORN, ALEX)(META, GRACE)(SCHWARZ, VICTORIA)(STAN, MADISON)(STAN, MEGAN)(WAHL, ALEXIS)
False

Your answer has less persons in it.

Not a kata issue, read this: https://docs.codewars.com/training/troubleshooting#expected-the-same