code: def test_not_hr_2_underscores(self):
      self.assertMarkdownRenders("__", "<p>__</p>")
  
imports: from markdown.test_tools import TestCase
label_desc: Use image node_id 44 for calling the TestHorizontalRules obj's underlying member method code with example usage: obj.test_not_hr_2_underscores() without return types