code: def test_dry_run(self):
      flow = naf.Sequential()
      results = flow.augment([])
      self.assertEqual(0, len(results))
  
file_path: nlpaug/test/flow/test_sequential.py
imports: import unittest
  import os
  import numpy
  from dotenv import load_dotenv
  import nlpaug.augmenter.char
  import nlpaug.augmenter.word
  import nlpaug.augmenter.spectrogram
  import nlpaug.augmenter.audio
  import nlpaug.flow
  from nlpaug.util import Action, AudioLoader
label_desc: Use image node_id 2 for calling the TestSequential obj's underlying member method code with example usage: obj.test_dry_run() without return types