Description
Since Wicket 6.0 it is possible to pass several event names to any AbstractDefaultAjaxBehavior via AjaxRequestAttributes#setEventNames(String...) or by using jQuery's specific compound event name (e.g. AjaxEventBehavior("eventOne eventTwo")).
WicketTesterHelper#findAjaxEventBehavior() currently can only work with AjaxEventBehavior and its specializations and only with full event name, i.e. the test should use "eventOne eventTwo".