AJAX get-Request无法正常工作

I am currently trying to call a php-script via this code:

    $.ajax({
    url: "test.php",
    type: "GET",
    success: function(data) 
    {
        console.log(data);
    },
    error: function (xml, error) {
        console.log(error);
    }}); 

The .php-File only contains

echo "TEST"

The problem is: All I get displayed in the console is a weird block of question marks...

Well - I spotted the problem (A long time ago, just hadn't the time to post it):

The Code was completely fine. The Problem was, however, that the path was wrong and so I sent the request to a old Test-Script that echoed an entire video...

So, if you have a similar problem: The code from above should work.