'Tests that the caller gets a 400 error if they don\'t request any
updates.'

def test_update_empty_body(self):

    service = self.start_service('compute').service_ref
    ex = self.assertRaises(webob.exc.HTTPBadRequest, self.controller.update, self.req, service.uuid, body={})
    self.assertEqual("No    updates    were    requested.    Fields    'status'    or    'forced_down'    should    be    specified.", six.text_type(ex))
