prevent random test failures
prevent random test failures

update #48

p4karthikeyan/jquery-ui-contextmenu,wangliming/jquery-ui-contextmenu,wangliming/jquery-ui-contextmenu,p4karthikeyan/jquery-ui-contextmenu,wangliming/jquery-ui-contextmenu,p4karthikeyan/jquery-ui-contextmenu