code: def test_with_nans(self, closed):
      index = self.create_index(closed=closed)
      assert index.hasnans is False
  
      result = index.isna()
      expected = np.zeros(len(index), dtype=bool)
      tm.assert_numpy_array_equal(result, expected)
  
      result = index.notna()
      expected = np.ones(len(index), dtype=bool)
      tm.assert_numpy_array_equal(result, expected)
  
      index = self.create_index_with_nan(closed=closed)
      assert index.hasnans is True
  
      result = index.isna()
      expected = np.array([False, True] + [False] * (len(index) - 2))
      tm.assert_numpy_array_equal(result, expected)
  
      result = index.notna()
      expected = np.array([True, False] + [True] * (len(index) - 2))
      tm.assert_numpy_array_equal(result, expected)
  
imports: from itertools import permutations
  import re
  import numpy
  import pytest
  import pandas
  from pandas import Index, Interval, IntervalIndex, Timedelta, Timestamp, date_range, interval_range, isna, notna, timedelta_range
  import pandas._testing
  import pandas.core.common
label_desc: Use image node_id 5 for calling the TestIntervalIndex obj's underlying member method code with example usage: obj.test_with_nans(closed) without return types