code: def test_duration(self):
      duration = 1
      audio_size = len(self.audio)
  
      for _ in range(10):
          aug = naa.CropAug(
              sampling_rate=self.sampling_rate,
              duration=duration,
              stateless=False,
          )
          augmented_data = aug.augment(self.audio)
          augmented_audio = augmented_data[0]
  
          aug_size = len(augmented_audio)
          expected_crop_size = self.sampling_rate * duration
  
          self.assertGreater(audio_size, aug_size)
          self.assertEqual(
              len(self.audio[aug.start_pos : aug.end_pos]),
              expected_crop_size,
          )
  
file_path: nlpaug/test/augmenter/audio/test_crop.py
imports: import unittest
  import os
  import numpy
  from dotenv import load_dotenv
  import nlpaug.augmenter.audio
  from nlpaug.util import AudioLoader
label_desc: Use image node_id 5 for calling the TestCrop obj's underlying member method code with example usage: obj.test_duration() without return types