code: def test_map(self):
      # test_map_dictlike generally tests
  
      index = PeriodIndex([2005, 2007, 2009], freq="Y")
      result = index.map(lambda x: x.ordinal)
      exp = Index([x.ordinal for x in index])
      tm.assert_index_equal(result, exp)
  
file_path: pandas/pandas/tests/indexes/period/test_period.py
imports: import numpy
  import pytest
  from pandas import Index, NaT, Period, PeriodIndex, Series, date_range, offsets, period_range
  import pandas._testing
label_desc: Use image node_id 10 for calling the TestPeriodIndex obj's underlying member method code with example usage: obj.test_map() without return types