code: def test_hr_hyphens_spaces_long(self):
      self.assertMarkdownRenders("- - - - - - -", "<hr />")
  
imports: from markdown.test_tools import TestCase
label_desc: Use image node_id 16 for calling the TestHorizontalRules obj's underlying member method code with example usage: obj.test_hr_hyphens_spaces_long() without return types