Print the input yourself: https://docs.codewars.com/training/troubleshooting/#print-input

What? It's completely fair. The example tests have the correct data. How you manage it it your business. And by the way, please mind your language.

I think now I understand your problem (though I still don't get why your code would fail if it were correct), random tests display things like testing for validate_pin(157704) (but also testing for validate_pin(xZxS2J?), which could have made you understand it was all strings), it would be clearer if the log was testing for validate_pin('xZxS2J?'). I'll publish a new fork with this change.

what language is that?

???

The description says If the function is passed a valid PIN string, return true, else return false., so I can't see the problem.

Also, the title of the kata is Regex validate PIN Code. Though the use of regexes is not enforced, regexes only apply to strings.

And having a look at sample tests like I told you you would have seen you were passed strings. How would they pass you something like "a234" if it were not a string??

I'm not sure to understand your problem but as stated in the description, and as you can see having a look at sample test cases (just under the code editor window), the inputs in this kata are all strings.

307599 - False should equal True means, necessarily, your function returns False in this case. And the culprit is your code. This may help you debugging: https://docs.codewars.com/training/troubleshooting/

https://docs.codewars.com/training/troubleshooting/#post-discourse