code: def test_modified_indices(self, attacked_text):
      new_text = attacked_text.insert_text_after_word_index(
          2, "a very long way"
      ).insert_text_after_word_index(20, "on the couch")
      assert (
          new_text.text
          == "A person walks a very long way up stairs into a room and sees beer poured from a keg and people on the couch talking."
      )
      for old_idx, new_idx in enumerate(
          new_text.attack_attrs["original_index_map"]
      ):
          assert (
              attacked_text.words[old_idx] == new_text.words[new_idx]
          ) or (new_idx == -1)
      new_text = (
          new_text.delete_word_at_index(0)
          .delete_word_at_index(15)
          .delete_word_at_index(15)
          .delete_word_at_index(15)
          .delete_word_at_index(20)
      )
      for old_idx, new_idx in enumerate(
          new_text.attack_attrs["original_index_map"]
      ):
          assert (
              attacked_text.words[old_idx] == new_text.words[new_idx]
          ) or (new_idx == -1)
      assert (
          new_text.text
          == "person walks a very long way up stairs into a room and sees beer poured and people on the couch."
      )
  
imports: import collections
  import pytest
label_desc: Use image node_id 14 for calling the TestAttackedText obj's underlying member method code with example usage: obj.test_modified_indices(attacked_text) without return types