code: def test_include_mathjax_cdn_div(self):
      html = plotly.offline.plot(
          fig, include_mathjax="cdn", output_type="div"
      )
  
      self.assertIn(plotly_config_script, html)
      self.assertIn(PLOTLYJS, html)
      self.assertIn(mathjax_cdn_script, html)
      self.assertIn(mathjax_font, html)
  
imports: import json
  import os
  from unittest import TestCase
  import pytest
  import plotly
  import plotly.io
  from plotly.io._utils import plotly_cdn_url
label_desc: Use image node_id 22 for calling the PlotlyOfflineTestCase obj's underlying member method code with example usage: obj.test_include_mathjax_cdn_div() without return types