A lot of duplication. Lets rewrite it so:
```javascript
var initialData = [
    ...,
    {
        range: 'in ]80,100[',
        value: 90,
        expectation: 'very loud' 
    },
    {
        range: 'maximum',
        value: 100,
        expectation: 'maximum' 
    }
];

$.each(initialData, function(index, data) {
    describe('when the new volume is ' + data.range, function() {
        
        beforeEach(function() {
            videoVolumeControl.onChange(void 0, {
                value: data.value
            });
        });

        it('changes ARIA attributes', function () {
            var sliderHandle = $('div.volume-slider>a.ui-slider-handle');

            expect(sliderHandle).toHaveAttr('aria-valuenow', data.value);
            expect(sliderHandle).toHaveAttr('aria-valuetext', data.expectation);
        });
    });
});
```