code: def test_identity(self, im_shape, input_type):
      data = self.get_data(im_shape, input_type)
      alpha = 0.0
      t = GibbsNoised(KEYS, alpha)
      out = t(deepcopy(data))
      for k in KEYS:
          assert_allclose(
              out[k], data[k], atol=1e-2, type_test="tensor"
          )
  
file_path: MONAI/tests/test_gibbs_noised.py
imports: from __future__ import annotations
  import unittest
  from copy import deepcopy
  import numpy
  from parameterized import parameterized
  from monai.data.synthetic import create_test_image_2d, create_test_image_3d
  from monai.transforms import GibbsNoised
  from monai.utils.misc import set_determinism
  from monai.utils.module import optional_import
  from tests.utils import TEST_NDARRAYS, assert_allclose
label_desc: Use image node_id 5 for calling the TestGibbsNoised obj's underlying member method code with example usage: obj.test_identity(im_shape, input_type) without return types