Tests that getTargetInfo works.
{
attached : true
browserContextId : <string>
canAccessOpener : false
targetId : <string>
title : 127.0.0.1:8000/inspector-protocol/resources/inspector-protocol-page.html
type : page
url : http://127.0.0.1:8000/inspector-protocol/resources/inspector-protocol-page.html
}