the guard does not work correctly - i.e.

• it timeouts

• or it ends prematurely (when page is partially updated)

sendKeys behaves as you would expect from a real user interaction - several characters are typed sequentially, which is accompanied by appropriate number of keydown/keypress/keyup events and it does not fire any blur event

guard actually wraps exactly one XHR request, which is triggered by appropriate user interaction

if your application triggers AJAX request when blur happens, then you need to guard blur event (either click to another input or to body element):

• input.sendKeys("abc"); guardAjax(body).click();

if your application triggers AJAX request when keydown/keyup happens, then you need to wait for a last update: 

• input.sendKeys("ab"); guardAjax(input).sendKeys("c");