code: def test_for_json_encodes_stand_alone_object(self):
      self.assertRoundTrip(ForJson(), ForJson().for_json())
  
imports: import unittest
  import simplejson
label_desc: Use image node_id 2 for calling the TestForJson obj's underlying member method code with example usage: obj.test_for_json_encodes_stand_alone_object() without return types