code: def testDefaultParseValueSpecialStrings(self):
      self.assertEqual(parser.DefaultParseValue("-"), "-")
      self.assertEqual(parser.DefaultParseValue("--"), "--")
      self.assertEqual(parser.DefaultParseValue("---"), "---")
      self.assertEqual(parser.DefaultParseValue("----"), "----")
      self.assertEqual(parser.DefaultParseValue("None"), None)
      self.assertEqual(parser.DefaultParseValue("'None'"), "None")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from fire import parser
  from fire import testutils
label_desc: Use image node_id 5 for calling the ParserTest obj's underlying member method code with example usage: obj.testDefaultParseValueSpecialStrings() without return types