'Verify urns have been deleted.'

def VerifyEmpty(self, urns):

    try:
        for urn in urns:
            aff4.FACTORY.Open(urn, aff4_type=aff4.AFF4Volume, token=self.token)
    except aff4.InstantiationError:
        raise TestStateUncleanError(("Path    wasn't    deleted:    %s" % traceback.format_exc()))
