code: def test_mixed_string_comparisons_ufuncs_with_cast(op, ufunc, sym):
      arr_string = np.array(["a", "b"], dtype="S")
      arr_unicode = np.array(["a", "c"], dtype="U")
  
      # While there is no loop, manual casting is acceptable:
      res1 = ufunc(
          arr_string, arr_unicode, signature="UU->?", casting="unsafe"
      )
      res2 = ufunc(
          arr_string, arr_unicode, signature="SS->?", casting="unsafe"
      )
  
      expected = op(arr_string.astype("U"), arr_unicode)
      assert_array_equal(res1, expected)
      assert_array_equal(res2, expected)
  
imports: import pytest
  import operator
  import numpy
  from numpy.testing import assert_array_equal, assert_raises
label_desc: Use image node_id 2 for calling a global function with example usage: test_mixed_string_comparisons_ufuncs_with_cast(op, ufunc, sym) without return types