code: def test_optimize_autosave(self):
      with tempfile.TemporaryDirectory() as directory:
          filepath = directory + "/optimize_params"
  
          # non-existing file, readonly=True
          with testing.assert_warns(UserWarning):
              with cupyx.optimizing.optimize(
                  path=filepath, readonly=True
              ):
                  cupy.sum(cupy.arange(2))
  
          # non-existing file, readonly=False
          with cupyx.optimizing.optimize(path=filepath, readonly=False):
              cupy.sum(cupy.arange(4))
          filesize = os.stat(filepath).st_size
          assert 0 < filesize
  
          # existing file, readonly=True
          with cupyx.optimizing.optimize(path=filepath, readonly=True):
              cupy.sum(cupy.arange(6))
          assert filesize == os.stat(filepath).st_size
  
          # existing file, readonly=False
          with cupyx.optimizing.optimize(path=filepath, readonly=False):
              cupy.sum(cupy.arange(8))
          assert filesize <= os.stat(filepath).st_size
  
imports: import os
  import tempfile
  import unittest
  from unittest import mock
  import pytest
  import cupy
  from cupy import testing
  from cupy._core import _accelerator
label_desc: Use image node_id 6 for calling the TestOptimize obj's underlying member method code with example usage: obj.test_optimize_autosave() without return types