code: def test_underline(self):
      text = formatting.Underline("hello")
      self.assertIn(text, ["hello", "\x1b[4mhello\x1b[0m"])
  
file_path: python-fire/fire/formatting_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from fire import formatting
  from fire import testutils
label_desc: Use image node_id 2 for calling the FormattingTest obj's underlying member method code with example usage: obj.test_underline() without return types