QUnit - test in loop, index always the same

I am trying to test some code and for that I need to make some tests in loop, like this:

for (var i = 1; i <= 5; i++) {
    QUnit.test('Hello ' + i, (assert) => {
        console.log(i);
        assert.ok( 1 == '1', 'Result: ' + i);
    });
}

Click here for working example at jsFiddle

But for some reason i in the loop (and result) is always 6, so this code gives me output like this:

6
6
6
6
6

What am I doing wrong?