in some test with 123456789 also strange problem:
when i do 123456789 it returns 1234567898 but expected -1
but when i try to return -1 for case 123456789; it's also wrong ))

At least PHP does though :)

Neither in Python, Java, Swift, C#. I'm not sure there is a single language with random tests for this kata.

No random tests for 4 years (in JavaScript (and Haskell i think)), and still no random tests? Isn't someone going to add them?

I would, but don't have the honor to edit katas

Author is gone, BTW (last seen nov 2018)

I changed to long in java but still stuck at test 4 and 5, while its giving me good output in netbeans