The tests are the same in all languages. 1840 guys passed the kata (236 in C#). I am afraid you didn't read the description.

As another guy said below (you could have read that):

For every possibility/combination of strings in each array, computes the following:
abs(length(x) − length(y)), where x belongs to array1 and y belongs to $array2
Finally, returns the largest/maximum value found.

Good luck and happy coding!