ES2015 function shorthand notation in an Object dilemma!

Hey guys,

I have a question regarding the reference of the this key word in the following examples. Because in a course (not on treehouse) a veteran javascript developer explained that the this key word from the second example referees to the global object (like the ()=> does), but when trying it out, it looks like it refers to the object like a normal function declaration.

var test1 = {
    testFunc: function() {
        console.log(this);
    }
};
test1.testFunc(); 

var test2 = {
    testFunc() {
        console.log(this);
    }
};
test2.testFunc();

var test3 = {
    testFunc: ()=> {
        console.log(this);
    }
};
test3.testFunc();

1. Test1 - console.logs this to the Object
2. Test2 - console.logs this to the Object ALSO ( but the instructor said this points to the Global obj like test 3)
3. Test3 - console.logs to the global obj

My actual question is. Was that the case in ES2015 and they've changed it in ES2016 and maybe that course was old, or the instructor got it wrong although I doubt that.