docstr: Test rendering of nice reports.
docstr_tok: ["Test","rendering","of","nice","reports","."]
code: def test_report_render(self):
      """
      Test rendering of nice reports.
      """
      report_s = nice_report({"foo": 3})
      assert "foo" in report_s
      assert "3" in report_s
      assert nice_report({}) == ""
  
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 1 for calling the TestUtils obj's underlying member method code with example usage: obj.test_report_render() without return types