code: def testEnsureLocalFromGCS(self, mock_copy_file):
      file_path = "gs://path/to/testdata/test_fn.py"
      local_file_path = io_utils.ensure_local(file_path)
      self.assertEndsWith(local_file_path, "/test_fn.py")
      self.assertFalse(
          any(
              [
                  local_file_path.startswith(prefix)
                  for prefix in io_utils._REMOTE_FS_PREFIX
              ]
          )
      )
      mock_copy_file.assert_called_once_with(
          file_path, local_file_path, True
      )
  
imports: import os
  from unittest import mock
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.utils import io_utils
  from tensorflow.python.lib.io import file_io
label_desc: Use image node_id 9 for calling the IoUtilsTest obj's underlying member method code with example usage: obj.testEnsureLocalFromGCS(mock_copy_file) without return types