code: def test_slice_locs_na(self):
      index = Index([np.nan, 1, 2])
      assert index.slice_locs(1) == (1, 3)
      assert index.slice_locs(np.nan) == (0, 3)
  
      index = Index([0, np.nan, np.nan, 1, 2])
      assert index.slice_locs(np.nan) == (1, 5)
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, Index, RangeIndex, Series, Timestamp
  import pandas._testing
  from pandas.core.arrays import ArrowExtensionArray, FloatingArray
label_desc: Use image node_id 4 for calling the TestSliceLocs obj's underlying member method code with example usage: obj.test_slice_locs_na() without return types