class_docstr: Test ParlaiParser.
class_docstr_tok: ["Test","ParlaiParser","."]
docstr: Test whether recommended args work for a group.
docstr_tok: ["Test","whether","recommended","args","work","for","a","group","."]
code: def test_recommendations_group(self):
      """
      Test whether recommended args work for a group.
      """
      parser = ParlaiParser(False, False)
      parser_grp = parser.add_argument_group("Test Group")
      parser_grp.add_argument(
          "-bs",
          "--batchsize",
          default=1,
          type=int,
          help="batch size for minibatch training schemes",
          recommended=1337,
      )
      parser.parse_args([])
  
      help_str = parser.format_help()
      assert "Test Group" in help_str
      _, latter = help_str.split("Test Group")
      assert "recommended:" in latter
      assert "1337" in latter
  
imports: import os
  import json
  import unittest
  from parlai.core.params import ParlaiParser
  import parlai.core.agents
  import parlai.utils.testing
label_desc: Use image node_id 5 for calling the TestParlaiParser obj's underlying member method code with example usage: obj.test_recommendations_group() without return types