class_docstr: Test the config system.
class_docstr_tok: ["Test","the","config","system","."]
code: def test_global_dev_mode(self):
      config.set_option("global.developmentMode", True)
      self.assertEqual(
          True, config.get_option("global.developmentMode")
      )
  
imports: import copy
  import os
  import textwrap
  import unittest
  from unittest.mock import MagicMock, mock_open, patch
  import pytest
  from parameterized import parameterized
  from streamlit import config, env_util
  from streamlit.config_option import ConfigOption
  from streamlit.errors import StreamlitAPIException
label_desc: Use image node_id 35 for calling the ConfigTest obj's underlying member method code with example usage: obj.test_global_dev_mode() without return types