code: def test_can_set_lstrip(self):
      added_token = AddedToken("<mask>", lstrip=True)
      assert added_token.rstrip == False
      assert added_token.lstrip == True
      assert added_token.single_word == False
      assert added_token.normalized == True
  
imports: import pickle
  import numpy
  import pytest
  from tokenizers import AddedToken, Encoding, Tokenizer
  from tokenizers.implementations import BertWordPieceTokenizer
  from tokenizers.models import BPE, Model, WordPiece, Unigram
  from tokenizers.normalizers import Lowercase
  from tokenizers.pre_tokenizers import ByteLevel
  from tokenizers.processors import BertProcessing, RobertaProcessing
  from ..utils import bert_files, data_dir, multiprocessing_with_parallelism, roberta_files
label_desc: Use image node_id 3 for calling the TestAddedToken obj's underlying member method code with example usage: obj.test_can_set_lstrip() without return types