code: def test_complex_emphasis_smart_underscore_mid_word(self):
      self.assertMarkdownRenders(
          "This is text __bold_italic bold___ with more text",
          "<p>This is text __bold_italic bold___ with more text</p>",
      )
  
imports: from markdown.test_tools import TestCase
label_desc: Use image node_id 21 for calling the TestNotEmphasis obj's underlying member method code with example usage: obj.test_complex_emphasis_smart_underscore_mid_word() without return types