code: def test_round_sigfigs(self):
      x = 0
      y = 0
      assert round_sigfigs(x, 2) == y
  
      x = 100
      y = 100
      assert round_sigfigs(x, 2) == y
  
      x = 0.01
      y = 0.01
      assert round_sigfigs(x, 2) == y
  
      x = 0.00123
      y = 0.001
      assert round_sigfigs(x, 1) == y
  
      x = 0.37
      y = 0.4
      assert round_sigfigs(x, 1) == y
  
      x = 2353
      y = 2350
      assert round_sigfigs(x, 3) == y
  
      x = 3547345734
      y = 3547350000
      assert round_sigfigs(x, 6) == y
  
      x = 0.0000046246
      y = 0.00000462
      assert round_sigfigs(x, 3) == y
  
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 2 for calling the TestUtils obj's underlying member method code with example usage: obj.test_round_sigfigs() without return types