code: def setLocalDir(self, tmp_path, monkeypatch):
      monkeypatch.setenv(
          "RAY_AIR_LOCAL_CACHE_DIR", str(tmp_path / "ray_results")
      )
  
imports: import os
  import pickle
  import shutil
  import tempfile
  import unittest
  import pytest
  import ray
  from ray import tune
  from ray.train import CheckpointConfig
  from ray.tune import Trainable
  from ray.tune.utils import validate_save_restore
label_desc: Use image node_id 1 for calling the SerialTuneRelativeLocalDirTest obj's underlying member method code with example usage: obj.setLocalDir(tmp_path, monkeypatch) without return types