code: def test_constructor_default_values(self):
      key = "mysection.myName"
      c = ConfigOption(key)
      self.assertEqual("mysection", c.section)
      self.assertEqual("myName", c.name)
      self.assertEqual(None, c.description)
      self.assertEqual("visible", c.visibility)
  
file_path: streamlit/lib/tests/streamlit/config_option_test.py
imports: import unittest
  import pytest
  from parameterized import parameterized
  from streamlit.config_option import ConfigOption, DeprecationError
label_desc: Use image node_id 3 for calling the ConfigOptionTest obj's underlying member method code with example usage: obj.test_constructor_default_values() without return types