code: def test_load_pdfs(self):
      execute_query_fetch_all(
          self.evadb,
          f"""LOAD DOCUMENT '{EvaDB_ROOT_DIR}/data/documents/*.pdf' INTO pdfs;""",
      )
      result = execute_query_fetch_all(
          self.evadb, "SELECT * from pdfs;"
      )
      self.assertEqual(len(result.columns), 4)
      self.assertEqual(len(result), 26)
  
imports: import glob
  import multiprocessing
  import os
  import shutil
  import tempfile
  import unittest
  from pathlib import Path
  from test.util import create_dummy_batches, create_dummy_csv_batches, create_large_scale_image_dataset, create_sample_csv, create_sample_video, file_remove, get_evadb_for_testing, shutdown_ray
  import numpy
  import pandas
  import pytest
  from evadb.binder.binder_utils import BinderError
  from evadb.configuration.constants import EvaDB_ROOT_DIR
  from evadb.executor.executor_utils import ExecutorError
  from evadb.models.storage.batch import Batch
  from evadb.parser.types import FileFormatType
  from evadb.server.command_handler import execute_query_fetch_all
label_desc: Use image node_id 23 for calling the LoadExecutorTests obj's underlying member method code with example usage: obj.test_load_pdfs() without return types