code: def test_dictionary_save_and_load():
      dictionary: Dictionary = Dictionary(add_unk=False)
  
      dictionary.add_item("class_1")
      dictionary.add_item("class_2")
      dictionary.add_item("class_3")
  
      file_path = "dictionary.txt"
  
      dictionary.save(file_path)
      loaded_dictionary = dictionary.load_from_file(file_path)
  
      assert len(dictionary) == len(loaded_dictionary)
      assert len(dictionary.get_items()) == len(
          loaded_dictionary.get_items()
      )
  
      # clean up file
      os.remove(file_path)
  
imports: import os
  import pytest
  import flair
  from flair.data import Corpus, Dictionary, Label, Sentence
  from flair.datasets import ColumnCorpus, FlairDatapointDataset, SentenceDataset
label_desc: Use image node_id 5 for calling a global function with example usage: test_dictionary_save_and_load() without return types