code: def test_dumps(self):
      self.assertEqual(json.dumps({}), "{}")
  
imports: from unittest import TestCase
  from simplejson.compat import StringIO, long_type, b, binary_type, text_type, PY3
  import simplejson
label_desc: Use image node_id 4 for calling the TestDump obj's underlying member method code with example usage: obj.test_dumps() without return types