code: def test_preprocessing(self):
      nlp = English()
      preprocessor = BertPreprocessor(nlp=nlp)
      data = (
          "I love my dog. He is the best. He eats and poops.",
          "Me and my dog.",
      )
      data_preprocessed = preprocessor(data)
      self.assertEqual(
          (
              "[CLS] I love my dog. [SEP] [CLS] He is the best. [SEP] [CLS] He eats and poops. [SEP]",
              "[CLS] Me and my dog. [SEP]",
          ),
          data_preprocessed,
      )
  
imports: import unittest
  from spacy.lang.en import English
  from headliner.preprocessing.bert_preprocessor import BertPreprocessor
label_desc: Use image node_id 1 for calling the TestBertPreprocessor obj's underlying member method code with example usage: obj.test_preprocessing() without return types