code: def test_loc_getitem_listlike_unused_category(self, df2):
      # GH#37901 a label that is in index.categories but not in index
      # listlike containing an element in the categories but not in the values
      with pytest.raises(
          KeyError, match=re.escape("['e'] not in index")
      ):
          df2.loc[["a", "b", "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 8 for calling the TestCategoricalIndex obj's underlying member method code with example usage: obj.test_loc_getitem_listlike_unused_category(df2) without return types