Where did the globalTitle change?!

Hello everyone, I wanted to know why the first test case
" The globalTitle variable should not change."
does not pass with my return.

function urlSlug(title) {
    return title.toLowerCase().match(/\w+/g).join("-"); 

The first test is there because you should not modify global variables.
You should not make any changes to this line:

var globalTitle = "Winter Is Coming";

I can’t imagine this error :smiley: , I was just testing another value !!