code: def test_dictionary_get_items_without_unk():
      dictionary: Dictionary = Dictionary(add_unk=False)
  
      dictionary.add_item("class_1")
      dictionary.add_item("class_2")
      dictionary.add_item("class_3")
  
      items = dictionary.get_items()
  
      assert len(items) == 3
      assert items[0] == "class_1"
      assert items[1] == "class_2"
      assert items[2] == "class_3"
  
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 2 for calling a global function with example usage: test_dictionary_get_items_without_unk() without return types