code: def test_empty_list(self):
      self.assertMarkdownRenders(
          "*foo*{ }", "<p><em>foo</em>{ }</p>", extensions=["attr_list"]
      )
  
imports: from markdown.test_tools import TestCase
label_desc: Use image node_id 1 for calling the TestAttrList obj's underlying member method code with example usage: obj.test_empty_list() without return types