code: def setUpClass(self):
      try_to_import_decord()
      self.video_file_url = create_sample_video()
      self.video_with_audio_file_url = (
          f"{EvaDB_ROOT_DIR}/data/sample_videos/touchdown.mp4"
      )
      self.frame_size = FRAME_SIZE[0] * FRAME_SIZE[1] * 3
      self.audio_frames = []
      for line in open(
          f"{EvaDB_ROOT_DIR}/test/data/touchdown_audio_frames.csv"
      ).readlines():
          self.audio_frames.append(np.fromstring(line, sep=","))
  
imports: import unittest
  from test.util import FRAME_SIZE, NUM_FRAMES, create_dummy_batches, create_sample_video, file_remove
  import numpy
  import pytest
  from evadb.configuration.constants import EvaDB_ROOT_DIR
  from evadb.constants import AUDIORATE, IFRAMES
  from evadb.expression.abstract_expression import ExpressionType
  from evadb.expression.comparison_expression import ComparisonExpression
  from evadb.expression.constant_value_expression import ConstantValueExpression
  from evadb.expression.logical_expression import LogicalExpression
  from evadb.expression.tuple_value_expression import TupleValueExpression
  from evadb.readers.decord_reader import DecordReader
  from evadb.utils.generic_utils import try_to_import_decord
label_desc: Use image node_id 1 for calling the DecordLoaderTest obj's underlying member method code with example usage: obj.setUpClass() without return types