code: def test_find_entity(self):
      entity_list = ads_ins.find_entity(sample)
      self.assertTrue(type(entity_list) == list)
      for i, word_id in enumerate(entity_list):
          self.assertTrue(type(word_id) == list)
          self.assertEqual(len(word_id), word_id[-1] - word_id[0] + 1)
          if i > 0:
              self.assertTrue(word_id[0] - entity_list[i - 1][-1] > 1)
  
file_path: textflint/test/generation/transformation/DP/test_add_sub_tree.py
imports: import unittest
  from textflint.input.component.sample.dp_sample import DPSample
  from textflint.generation.transformation.DP.add_sub_tree import AddSubTree
  from textflint.common.utils.error import FlintError
label_desc: Use image node_id 2 for calling the TestSpecialAddSubtree obj's underlying member method code with example usage: obj.test_find_entity() without return types