code: def test_config_prefix(self):
      with cf.config_prefix("base"):
          cf.register_option("a", 1, "doc1")
          cf.register_option("b", 2, "doc2")
          assert cf.get_option("a") == 1
          assert cf.get_option("b") == 2
  
          cf.set_option("a", 3)
          cf.set_option("b", 4)
          assert cf.get_option("a") == 3
          assert cf.get_option("b") == 4
  
      assert cf.get_option("base.a") == 3
      assert cf.get_option("base.b") == 4
      assert "doc1" in cf.describe_option("base.a", _print_desc=False)
      assert "doc2" in cf.describe_option("base.b", _print_desc=False)
  
      cf.reset_option("base.a")
      cf.reset_option("base.b")
  
      with cf.config_prefix("base"):
          assert cf.get_option("a") == 1
          assert cf.get_option("b") == 2
  
imports: import pytest
  from pandas._config import config
  from pandas._config.config import OptionError
  import pandas
  import pandas._testing
label_desc: Use image node_id 17 for calling the TestConfig obj's underlying member method code with example usage: obj.test_config_prefix() without return types