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
}