code: def test_identityd(self):
      for p in TEST_NDARRAYS:
          img = p(self.imt)
          data = {"img": img}
          identity = Identityd(keys=data.keys())
          assert_allclose(img, identity(data)["img"])
  
imports: from __future__ import annotations
  import unittest
  from monai.transforms.utility.dictionary import Identityd
  from tests.utils import TEST_NDARRAYS, NumpyImageTestCase2D, assert_allclose
label_desc: Use image node_id 1 for calling the TestIdentityd obj's underlying member method code with example usage: obj.test_identityd() without return types