code: def test_readers(self):
      inst = ITKReader()
      self.assertIsInstance(inst, ITKReader)
  
      inst = NibabelReader()
      self.assertIsInstance(inst, NibabelReader)
      inst = NibabelReader(as_closest_canonical=True)
      self.assertIsInstance(inst, NibabelReader)
  
      inst = PydicomReader()
      self.assertIsInstance(inst, PydicomReader)
  
      inst = NumpyReader()
      self.assertIsInstance(inst, NumpyReader)
      inst = NumpyReader(npz_keys="test")
      self.assertIsInstance(inst, NumpyReader)
  
      inst = PILReader()
      self.assertIsInstance(inst, PILReader)
  
      inst = NrrdReader()
      self.assertIsInstance(inst, NrrdReader)
  
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 2 for calling the TestInitLoadImage obj's underlying member method code with example usage: obj.test_readers() without return types