'Verify that list_queued() method handles a case when no images were
queued without errors.'

@mock.patch.object(glance.image_cache.client.CacheClient, 'get_queued_images')
def test_list_queued_images_empty(self, mock_images):

    mock_images.return_value = []
    self.assertEqual(cache_manage.SUCCESS, cache_manage.list_queued(mock.Mock(), ''))
