<div id="wrapper" style="width: 500px; height: 500px; overflow: auto;">
    <div style="width: 1px; height: 2000px"></div>
</div>

...
await t.expect(await ztl.hasVScrollbar({locator:Selector(() => jq('#wrapper')[0])})).ok();

export async function hasVScrollbar(config) {
	config.locator = await config.locator();
	return await ClientFunction(() => {
                        // omitted
			var borderHeight = Math.round(parseInt(locator.css('borderLeftWidth'))) + Math.round(parseInt(locator.css('borderRightWidth'))),
				scrollbarHeight = locator[0].offsetHeight - borderHeight - locator[0].clientHeight;
			return scrollbarHeight > 0;
		}
	}, {dependencies: {config}})();
}