code: def test_load_image(self):
      instance1 = LoadImage(image_only=False, dtype=None)
      instance2 = LoadImage(image_only=True, dtype=None)
      self.assertIsInstance(instance1, LoadImage)
      self.assertIsInstance(instance2, LoadImage)
  
      for r in [
          "NibabelReader",
          "PILReader",
          "ITKReader",
          "NumpyReader",
          "NrrdReader",
          "PydicomReader",
          None,
      ]:
          inst = LoadImaged("image", reader=r)
          self.assertIsInstance(inst, LoadImaged)
  
file_path: MONAI/tests/test_init_reader.py
imports: from __future__ import annotations
  import unittest
  from monai.data import ITKReader, NibabelReader, NrrdReader, NumpyReader, PILReader, PydicomReader
  from monai.transforms import LoadImage, LoadImaged
  from tests.utils import SkipIfNoModule
label_desc: Use image node_id 1 for calling the TestInitLoadImage obj's underlying member method code with example usage: obj.test_load_image() without return types