code: def test__make_img_list_non_validation(self):
      with patch("os.listdir", side_effect=self.fake_folders):
          with patch(
              "ISR.utils.datahandler.DataHandler._check_dataset",
              return_value=True,
          ):
              DH = DataHandler(
                  lr_dir={"res": "lr", "matching": False},
                  hr_dir={"res": "hr", "matching": False},
                  patch_size=0,
                  scale=0,
                  n_validation_samples=None,
              )
  
      expected_ls = {
          "hr": ["data0.jpeg", "data1.png"],
          "lr": ["data1.png"],
      }
      self.assertTrue(np.all(DH.img_list["hr"] == expected_ls["hr"]))
      self.assertTrue(np.all(DH.img_list["lr"] == expected_ls["lr"]))
  
imports: import unittest
  import numpy
  from unittest.mock import patch
  from ISR.utils.datahandler import DataHandler
label_desc: Use image node_id 6 for calling the DataHandlerTest obj's underlying member method code with example usage: obj.test__make_img_list_non_validation() without return types