code: def test_get_validation_batches_valid_request(self):
      patch_size = 3
      with patch(
          "ISR.utils.datahandler.DataHandler._check_dataset",
          return_value=True,
      ):
          with patch("os.listdir", side_effect=self.fake_folders):
              DH = DataHandler(
                  lr_dir={"res": "lr", "matching": True},
                  hr_dir={"res": "hr", "matching": True},
                  patch_size=patch_size,
                  scale=2,
                  n_validation_samples=2,
              )
  
      with patch("imageio.imread", side_effect=self.image_getter):
          with patch("os.path.join", side_effect=self.path_giver):
              batch = DH.get_validation_batches(batch_size=12)
  
      self.assertTrue(len(batch) == 2)
      self.assertTrue(type(batch) is list)
      self.assertTrue(type(batch[0]) is dict)
      self.assertTrue(
          batch[0]["hr"].shape
          == (12, patch_size * 2, patch_size * 2, 3)
      )
      self.assertTrue(
          batch[0]["lr"].shape == (12, patch_size, patch_size, 3)
      )
      self.assertTrue(
          batch[1]["hr"].shape
          == (12, patch_size * 2, patch_size * 2, 3)
      )
      self.assertTrue(
          batch[1]["lr"].shape == (12, patch_size, patch_size, 3)
      )
  
imports: import unittest
  import numpy
  from unittest.mock import patch
  from ISR.utils.datahandler import DataHandler
label_desc: Use image node_id 18 for calling the DataHandlerTest obj's underlying member method code with example usage: obj.test_get_validation_batches_valid_request() without return types