code: def test_setops_sort_validation(self, method):
      idx1 = Index(["a", "b"])
      idx2 = Index(["b", "c"])
  
      with pytest.raises(
          ValueError, match="The 'sort' keyword only takes"
      ):
          getattr(idx1, method)(idx2, sort=2)
  
      # sort=True is supported as of GH#??
      getattr(idx1, method)(idx2, sort=True)
  
imports: from datetime import datetime
  import numpy
  import pytest
  import pandas
  from pandas import Index, Series
  import pandas._testing
  from pandas.core.algorithms import safe_sort
label_desc: Use image node_id 1 for calling the TestIndexSetOps obj's underlying member method code with example usage: obj.test_setops_sort_validation(method) without return types