code: def test_getitem_interval_with_nans(
      self, frame_or_series, indexer_sl
  ):
      # GH#41831
  
      index = IntervalIndex([np.nan, np.nan])
      key = index[:-1]
  
      obj = frame_or_series(range(2), index=index)
      if frame_or_series is DataFrame and indexer_sl is tm.setitem:
          obj = obj.T
  
      result = indexer_sl(obj)[key]
      expected = obj
  
      tm.assert_equal(result, expected)
  
file_path: pandas/pandas/tests/indexing/interval/test_interval.py
imports: import numpy
  import pytest
  from pandas._libs import index
  from pandas.compat import IS64
  import pandas
  from pandas import DataFrame, IntervalIndex, Series
  import pandas._testing
label_desc: Use image node_id 7 for calling the TestIntervalIndex obj's underlying member method code with example usage: obj.test_getitem_interval_with_nans(frame_or_series, indexer_sl) without return types