code: def test_sequence_methods(self):
      list_field = ListField([self.field1, self.field2, self.field3])
  
      assert len(list_field) == 3
      assert list_field[1] == self.field2
      assert [f for f in list_field] == [
          self.field1,
          self.field2,
          self.field3,
      ]
  
imports: from typing import Dict
  import numpy
  import torch
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.data import Token, Vocabulary, Instance
  from allennlp.data.fields import TextField, LabelField, ListField, IndexField, SequenceLabelField
  from allennlp.data.token_indexers import SingleIdTokenIndexer, TokenCharactersIndexer
  from allennlp.data.data_loaders import SimpleDataLoader
  from allennlp.data.tokenizers import SpacyTokenizer
  from allennlp.models import Model
  from allennlp.modules import Embedding
  from allennlp.modules.text_field_embedders import BasicTextFieldEmbedder
label_desc: Use image node_id 13 for calling the TestListField obj's underlying member method code with example usage: obj.test_sequence_methods() without return types