code: def test_get_indexer_with_nans(self):
      # GH#41831
      index = IntervalIndex([np.nan, Interval(1, 2), np.nan])
  
      expected = np.array([True, False, True])
      for key in [None, np.nan, NA]:
          assert key in index
          result = index.get_loc(key)
          tm.assert_numpy_array_equal(result, expected)
  
      for key in [
          NaT,
          np.timedelta64("NaT", "ns"),
          np.datetime64("NaT", "ns"),
      ]:
          with pytest.raises(KeyError, match=str(key)):
              index.get_loc(key)
  
imports: import re
  import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, CategoricalIndex, DatetimeIndex, Index, Interval, IntervalIndex, MultiIndex, NaT, Timedelta, Timestamp, array, date_range, interval_range, isna, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 9 for calling the TestGetLoc obj's underlying member method code with example usage: obj.test_get_indexer_with_nans() without return types