code: def testCreateOutputDirFailsWrite(self, mock_os):
      # Should fail if testfile can't be written.
      test_subdir = "temptest"
      full_testdir_path = os.path.join(self.testdata_dir, test_subdir)
      mock_os.path.isdir.return_value = True
  
      with mock.patch(
          "__builtin__.open", mock.mock_open(read_data="data")
      ):
          with open(full_testdir_path, "w") as mockfile:
              mockfile.write.side_effect = IOError()
              with self.assertRaises(IOError):
                  atlasmaker_io.create_output_dir_if_not_exist(
                      full_testdir_path
                  )
  
imports: import io
  import os
  import shutil
  import mock
  from absl.testing import absltest
  from PIL import Image
  from requests.exceptions import ConnectTimeout, ReadTimeout, InvalidURL
  import atlasmaker_io
label_desc: Use image node_id 4 for calling the AtlasmakerIOTests obj's underlying member method code with example usage: obj.testCreateOutputDirFailsWrite(mock_os) without return types