docstr: Tests that passing the checkpoint_dir right back works.
docstr_tok: ["Tests","that","passing","the","checkpoint_dir","right","back","works","."]
code: def testCheckpointWithNoop(self):
      """Tests that passing the checkpoint_dir right back works."""
  
      class MockTrainable(Trainable):
          def setup(self, config):
              pass
  
          def step(self):
              return {"score": 1}
  
          def save_checkpoint(self, checkpoint_dir):
              with open(
                  os.path.join(checkpoint_dir, "test.txt"), "wb"
              ) as f:
                  pickle.dump("test", f)
  
          def load_checkpoint(self, checkpoint_dir):
              with open(
                  os.path.join(checkpoint_dir, "test.txt"), "rb"
              ) as f:
                  x = pickle.load(f)
  
              assert x == "test"
  
      validate_save_restore(MockTrainable)
  
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 8 for calling the SerialTuneRelativeLocalDirTest obj's underlying member method code with example usage: obj.testCheckpointWithNoop() and returns: dict