code: def test_unequal_replace_field_at_indices(self):
      # test insert before index and mask
      ins_aft = sa_sample.unequal_replace_field_at_indices(
          "x", [2], [["$$$", "123"]]
      )
      self.assertEqual(
          "Brilliant and $$$ 123 performances by "
          "Tom Courtenay and Peter Finch",
          ins_aft.get_text("x"),
      )
      self.assertEqual(ins_aft.y.field_value, "negative")
      self.assertEqual(
          [0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 0], ins_aft.get_mask("x")
      )
  
file_path: textflint/test/input/component/sample/test_sa_sample.py
imports: import unittest
  from textflint.input.component.sample.sa_sample import *
label_desc: Use image node_id 3 for calling the TestSASample obj's underlying member method code with example usage: obj.test_unequal_replace_field_at_indices() without return types