parseBorderRadius = () => {
            const roundedCorners = self.displayOptions.layoutControls.roundedCorners;
            const parsedValue = Number(roundedCorners);

            return !isNaN(parsedValue) && parsedValue !== 0
                ? `${parsedValue}px`
                : roundedCorners;
        }
Checks if the volumebar is rendered and the styling applied by comparing
the width of 2 elements that should look different.

@returns Boolean