code: def test_find_learning_rate_args(self):
      parser = argparse.ArgumentParser(description="Testing")
      subparsers = parser.add_subparsers(title="Commands", metavar="")
      FindLearningRate().add_subparser(subparsers)
  
      for serialization_arg in ["-s", "--serialization-dir"]:
          raw_args = [
              "find-lr",
              "path/to/params",
              serialization_arg,
              "serialization_dir",
          ]
  
          args = parser.parse_args(raw_args)
  
          assert args.func == find_learning_rate_from_args
          assert args.param_path == "path/to/params"
          assert args.serialization_dir == "serialization_dir"
  
      # config is required
      with pytest.raises(SystemExit) as cm:
          parser.parse_args(["find-lr", "-s", "serialization_dir"])
          assert (
              cm.exception.code == 2
          )  # argparse code for incorrect usage
  
      # serialization dir is required
      with pytest.raises(SystemExit) as cm:
          parser.parse_args(["find-lr", "path/to/params"])
          assert cm.exception.code == 2
  
imports: import argparse
  import os
  import pytest
  from allennlp.common import Params
  from allennlp.data import Vocabulary
  from allennlp.models import Model
  from allennlp.common.checks import ConfigurationError
  from allennlp.common.testing import AllenNlpTestCase, requires_multi_gpu
  from allennlp.commands.find_learning_rate import search_learning_rate, find_learning_rate_from_args, find_learning_rate_model, FindLearningRate
  from allennlp.training import Trainer
  from allennlp.training.util import data_loaders_from_params
label_desc: Use image node_id 3 for calling the TestFindLearningRate obj's underlying member method code with example usage: obj.test_find_learning_rate_args() without return types