code: def test_extra_data(self):
      s = "[1, 2, 3]5"
      msg = "Extra data"
      self.assertRaisesRegex(self.JSONDecodeError, msg, self.loads, s)
  
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 8 for calling the TestDecode obj's underlying member method code with example usage: obj.test_extra_data() without return types