code: def test_html_stripping(self):
      stripper = search_index.ContentParser()
  
      stripper.feed("<h1>Testing</h1><p>Content</p>")
  
      self.assertEqual(stripper.stripped_html, "Testing\nContent")
  
imports: import json
  import unittest
  from unittest import mock
  from mkdocs.config.config_options import ValidationError
  from mkdocs.contrib import search
  from mkdocs.contrib.search import search_index
  from mkdocs.structure.files import File
  from mkdocs.structure.pages import Page
  from mkdocs.structure.toc import get_toc
  from mkdocs.tests.base import dedent, get_markdown_toc, load_config
label_desc: Use image node_id 1 for calling the SearchIndexTests obj's underlying member method code with example usage: obj.test_html_stripping() without return types