code: def test_deprecate_option(self):
      # we can deprecate non-existent options
      cf.deprecate_option("foo")
  
      assert cf._is_deprecated("foo")
      with tm.assert_produces_warning(
          FutureWarning, match="deprecated"
      ):
          with pytest.raises(KeyError, match="No such keys.s.: 'foo'"):
              cf.get_option("foo")
  
      cf.register_option("a", 1, "doc", validator=cf.is_int)
      cf.register_option("b.c", "hullo", "doc2")
      cf.register_option("foo", "hullo", "doc2")
  
      cf.deprecate_option("a", removal_ver="nifty_ver")
      with tm.assert_produces_warning(
          FutureWarning, match="eprecated.*nifty_ver"
      ):
          cf.get_option("a")
  
          msg = "Option 'a' has already been defined as deprecated"
          with pytest.raises(OptionError, match=msg):
              cf.deprecate_option("a")
  
      cf.deprecate_option("b.c", "zounds!")
      with tm.assert_produces_warning(FutureWarning, match="zounds!"):
          cf.get_option("b.c")
  
      # test rerouting keys
      cf.register_option("d.a", "foo", "doc2")
      cf.register_option("d.dep", "bar", "doc2")
      assert cf.get_option("d.a") == "foo"
      assert cf.get_option("d.dep") == "bar"
  
      cf.deprecate_option("d.dep", rkey="d.a")  # reroute d.dep to d.a
      with tm.assert_produces_warning(FutureWarning, match="eprecated"):
          assert cf.get_option("d.dep") == "foo"
  
      with tm.assert_produces_warning(FutureWarning, match="eprecated"):
          cf.set_option("d.dep", "baz")  # should overwrite "d.a"
  
      with tm.assert_produces_warning(FutureWarning, match="eprecated"):
          assert cf.get_option("d.dep") == "baz"
  
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 16 for calling the TestConfig obj's underlying member method code with example usage: obj.test_deprecate_option() without return types