code: def test_map_identity_mapping(index, request):
      # GH#12766
  
      result = index.map(lambda x: x)
      if index.dtype == object and result.dtype == bool:
          assert (index == result).all()
          # TODO: could work that into the 'exact="equiv"'?
          return  # FIXME: doesn't belong in this file anymore!
      tm.assert_index_equal(result, index, exact="equiv")
  
imports: import re
  import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  import pandas._testing
label_desc: Use image node_id 5 for calling a global function with example usage: test_map_identity_mapping(index, request) without return types