code: def test_loc_getitem_label_unused_category(self, df2):
      # element in the categories but not in the values
      with pytest.raises(KeyError, match=r"^'e'$"):
          df2.loc["e"]
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, CategoricalDtype, CategoricalIndex, DataFrame, Index, Interval, Series, Timedelta, Timestamp, option_context
  import pandas._testing
label_desc: Use image node_id 9 for calling the TestCategoricalIndex obj's underlying member method code with example usage: obj.test_loc_getitem_label_unused_category(df2) without return types