code: def get_dummy_block_records(self):
      block_records = np.array(
          [
              b"This is the first record",
              b"This is the second record",
              b"This is the third record",
              b"This is the fourth record",
              b"This is the fifth record",
              b"This is a longer longer longer record",
          ],
          dtype=np.object,
      )
      return block_records
  
imports: import os
  import shutil
  import tempfile
  from unittest import TestCase
  from unittest.mock import patch
  import numpy
  from datasets import Dataset
  from transformers.models.realm.configuration_realm import RealmConfig
  from transformers.models.realm.retrieval_realm import _REALM_BLOCK_RECORDS_FILENAME, RealmRetriever
  from transformers.models.realm.tokenization_realm import VOCAB_FILES_NAMES, RealmTokenizer
label_desc: Use image node_id 6 for calling the RealmRetrieverTest obj's underlying member method code with example usage: obj.get_dummy_block_records() and returns: block_records