code: def image_getter(self, res):
      if res == "hr":
          return np.random.random((20, 20, 3))
      else:
          return np.random.random((10, 10, 3))
  
imports: import unittest
  import numpy
  from unittest.mock import patch
  from ISR.utils.datahandler import DataHandler
label_desc: Use image node_id 5 for calling the DataHandlerTest obj's underlying member method code with example usage: obj.image_getter(res) and returns: np, np