code: def test_negative_index(self):
      d = self.json.JSONDecoder()
      self.assertRaises(ValueError, d.raw_decode, "a" * 42, -50000)
  
imports: import decimal
  from io import StringIO
  from collections import OrderedDict
  from test.test_json import PyTest, CTest
  from test import support
label_desc: Use image node_id 12 for calling the TestDecode obj's underlying member method code with example usage: obj.test_negative_index() without return types