code: def test_lambda_identity(self):
      for p in TEST_NDARRAYS:
          img = p(self.imt)
  
          def identity_func(x):
              return x
  
          lambd = Lambda(func=identity_func)
          assert_allclose(
              identity_func(img), lambd(img), type_test=False
          )
  
file_path: MONAI/tests/test_lambda.py
imports: from __future__ import annotations
  import unittest
  from numpy import ndarray
  from torch import Tensor
  from monai.data.meta_tensor import MetaTensor
  from monai.transforms.utility.array import Lambda
  from monai.utils.type_conversion import convert_to_numpy, convert_to_tensor
  from tests.utils import TEST_NDARRAYS, NumpyImageTestCase2D, assert_allclose
label_desc: Use image node_id 1 for calling the TestLambda obj's underlying member method code with example usage: obj.test_lambda_identity() and returns: x