code: def test_setnamedtupledefaults(self):
      from collections import namedtuple
  
      NT = namedtuple("NT", ("a", "b", "c"))
  
      # Shouldn't be able to construct a namedtuple without providing info
      try:
          NT()
          self.fail("Shouldn't be able to construct namedtuple")
      except TypeError:
          pass
  
      # Test setting default value
      set_namedtuple_defaults(NT)
      nt = NT()
      assert nt.a is None
      assert nt.b is None
      assert nt.c is None
  
      # Test setting it with something else
      set_namedtuple_defaults(NT, default=1)
      nt = NT()
      assert nt.a == 1
      assert nt.b == 1
      assert nt.c == 1
  
imports: from parlai.core.opt import Opt
  from parlai.utils.misc import Timer, round_sigfigs, set_namedtuple_defaults, nice_report
  import parlai.utils.strings
  from copy import deepcopy
  import random
  import time
  import unittest
  from parlai.utils.data import DatatypeHelper
  from parlai.utils.curated_response import generate_init_prompot, generate_safe_response
label_desc: Use image node_id 4 for calling the TestUtils obj's underlying member method code with example usage: obj.test_setnamedtupledefaults() without return types