code: def test_insert_field_after_index(self):
      absa_sample = ABSASample(data)
      # test insert before index and mask
      ins_aft = absa_sample.insert_field_after_index(
          "sentence", 2, "$$$"
      )
      self.assertEqual(
          "The bread is $$$ top notch as well.",
          ins_aft.get_text("sentence"),
      )
      self.assertEqual(
          [0, 0, 0, 2, 0, 0, 0, 0, 0], ins_aft.get_mask("sentence")
      )
  
file_path: textflint/test/input/component/sample/test_absa_sample.py
imports: import unittest
  from textflint.input.component.sample.absa_sample import *
label_desc: Use image node_id 3 for calling the TestABSASample obj's underlying member method code with example usage: obj.test_insert_field_after_index() without return types