Print the input.

Yes.

it's usually pretty useful for katas with tests that don't describe themselves to include a line in the beginning of your method that prints the input

I got same problem on same test case, after print out x and y.
x = 'abc', y = 'ac', instead of accept 'a' or 'c',

Result:
Expected: ac, instead got: c

is this correct?

you can write:

console.log(x);
console.log(y);

at the beginning of your function,then you can see the parameters when you run test cases

What is the third test case? My function works for all the tests before it, just not that one. It says "Expected: ac, instead got: a".

I think this Kata may be impossible if it can't calculate all possible paths, plus the instructions aren't clear enough. Does your solution just pick the max of the 2 closest to it, the max above it? That's what I'd do, but that doesn't always give you the max path. Or does it?

What is the 5th test case? My function throws an error and I don't know why.

I've got the same issue