I am not seeing of examination ( (lenString == 0) || (k > lenString) || (k <= 0) ) ?

Thank you for answer. I read "Troubleshooting Your Solution" "When I run "Test", everything passes, but when I hit “Attempt” tests fail".
As far as I understand "Attemp" consist of 2 parts: 1- handle basic cases (such as in "Test") 2-handle random cases.
Why in "Test" all basic test passed, but in "Attemp" basic test failed?

when i push Test

Time: 2042msPassed: 1Failed: 0
Test Results:
Test Example
should handle basic cases
Test Passed
Completed in 0.0796ms
You have passed all of the tests! :)

but when i push Attemp

Time: 2088msPassed: 1Failed: 1Exit Code: 1
Test Results:
Test Example
should handle basic cases
Test Failed
Log
Expected
: 3
to equal
: 1
Completed in 0.6610ms
should handle random cases
Test Passed
Completed in 0.0234ms

why basic test failed on Attemp, but not failed on Test?