Could you post your incorrect code with a spoiler flag please? I've just controlled JS tests and I'm surprised an incorrect solution could pass, I'd like to see where is failing your code, in order to suggest improvements and take it in account in a new translation I am preparing.

The basic test you are refering to expects 123. It's a problem with your code, though if your code fails only on this one it also means tests should be enhanced with adding some similar random tests (which means your code should not pass all the other tests if they were complete).