code: def test_dataset(self):
      super().test_dataset(self.known_num_frames, self.known_fps)
      self.assertEqual(
          self.get_ds().get_num_frames(), self.known_num_frames
      )
  
imports: from __future__ import annotations
  import os
  import unittest
  import torch
  import monai.transforms
  from monai.data.dataloader import DataLoader
  from monai.data.video_dataset import CameraDataset, VideoDataset, VideoFileDataset
  from monai.utils.module import optional_import
  from tests.utils import assert_allclose, download_url_or_skip_test, testing_data_config
label_desc: Use image node_id 2 for calling the TestVideoFileDataset obj's underlying member method code with example usage: obj.test_dataset() without return types