def METHOD_NAME(self):
    """
    Verify that the prediction of space used by the filesystem subcommand
    is the same as the prediction obtained by computing over the results
    obtained by calling the pool subcommand with different arguments and
    taking the difference.
    """
    encrypted = False
    overprovisioned = True
    device_sizes = [Range(1, TiB)]
    fs_sizes = [Range(1, GiB)]
    pool_result_pre = _call_predict_usage_pool(
        encrypted, device_sizes, fs_sizes=None, overprovision=overprovisioned
    )
    pool_result_post = _call_predict_usage_pool(
        encrypted,
        device_sizes,
        fs_sizes=fs_sizes,
        overprovision=overprovisioned,
    )
    filesystem_result = _call_predict_usage_filesystem(
        fs_sizes, overprovision=overprovisioned
    )
    self.assertEqual(
        Range(pool_result_post["used"]) - Range(pool_result_pre["used"]),
        Range(filesystem_result["used"]),
    )