code: def test_tokenize_add_sentence_markers(self):
      featurizer = SimpleFeaturizer.from_config(
          SimpleFeaturizer.Config(sentence_markers=("<s>", "</s>")),
          FeatureConfig(),
      )
      tokens = featurizer.featurize(
          InputRecord(raw_text=self.sentence)
      ).tokens
      self.assertListEqual(
          tokens, ["<s>", "order", "me", "a", "coffee", "</s>"]
      )
  
file_path: pytext/pytext/data/test/simple_featurizer_test.py
imports: import unittest
  from pytext.config.field_config import FeatureConfig
  from pytext.data.featurizer import InputRecord, SimpleFeaturizer
label_desc: Use image node_id 5 for calling the SimpleFeaturizerTest obj's underlying member method code with example usage: obj.test_tokenize_add_sentence_markers() without return types