in app/com/gu/contentapi/sanity/support/XmlFileSupport.scala [8:15]
def createModifiedXMLTempFile(originalXML: String, originalString: String, replacedString: String): String = {
val tempFile = File.createTempFile("TestIntegrationArticleModified-", ".xml")
val modifiedArticleXML = originalXML.replaceAll(originalString, replacedString)
val output = new PrintWriter(tempFile)
output.write(modifiedArticleXML)
output.close()
tempFile.getAbsolutePath
}