How to assert ascending/desciding order in response

Here you go:

def xml = """<?xml version="1.0" encoding="UTF-8"?> <er-response>    <subscriptions-v2>          <subscription id="909" status="1" />          <subscription id="908" status="1" />          <subscription id="904" status="2" />          <subscription id="898" status="1" />          <subscription id="897" status="1" />          <subscription id="896" status="2" />          <subscription id="895" status="1" />          <subscription id="7" status="1" />          <subscription id="6" status="1" />          <subscription id="5" status="11" />       </subscriptions-v2>   </er-response>"""
def parsedXml = new XmlSlurper().parseText(xml)
//Get the ids from the response
def idsFromResponse = parsedXml.'**'.findAll{ it.name() == 'subscription'}.collect{it.@id.text()}
println "Original list from response : $idsFromResponse"
//Sort the numbers in descending order
def descIds = idsFromResponse.sort(false).reverse()
assert idsFromResponse == descIds, "Response does not have the ids in descending order"