Dont trip on webtests due to this

A small gotcha when using Webtests which has caught a couple of pairs out is when your webtest is failing, citing a 404 as the cause whilst when you view the target URL using a browser it renders fine.

To flush this out, we enabled the following in our webtest (see storeResponseCode)

void webtest(String name, Closure yield) {
        ant.testSpec(name: name) {
            config(configMap) {
                option(name: "ThrowExceptionOnFailingStatusCode", value: false)
            }
            steps {
                yield.delegate = ant
                yield()
            }
        }

}

then added

        webtest("MyTest: some test"){
            invoke(url:'/urlThatWorks')
            storeResponseCode(property:"status")
            verifyProperty(name:"status", text:"200")
            .... [rest of test]
        }

Our test passed with 200 status code, thus revealing the clue... our advert IFRAME within the page was 404'ing and the actual cause of our webtest failure.