code: def test_should_flip_vertically(self):
      try_to_import_pillow()
      from PIL import Image
  
      img = Image.open(
          f"{EvaDB_ROOT_DIR}/test/data/uadetrac/small-data/MVI_20011/img00001.jpg"
      )
      arr = asarray(img)
      df = pd.DataFrame([[arr]])
      flipped_arr = self.vertical_flip_instance(df)[
          "vertically_flipped_frame_array"
      ]
  
      self.assertEqual(
          np.sum(arr[0, :] - np.flip(flipped_arr[0][-1, :], 1)), 0
      )
  
file_path: evadb/test/integration_tests/long/functions/ndarray/test_flips.py
imports: import unittest
  import numpy
  import pandas
  from numpy import asarray
  from evadb.configuration.constants import EvaDB_ROOT_DIR
  from evadb.functions.ndarray.horizontal_flip import HorizontalFlip
  from evadb.functions.ndarray.vertical_flip import VerticalFlip
  from evadb.utils.generic_utils import try_to_import_pillow
label_desc: Use image node_id 4 for calling the FlipTests obj's underlying member method code with example usage: obj.test_should_flip_vertically() without return types