code: def test_value(self, input_param, data, meta_key, expected):
      meta = IntensityStatsd(**input_param)(data)[meta_key]
      for k, v in expected.items():
          self.assertTrue(k in meta)
          np.testing.assert_allclose(v, meta[k], atol=1e-3)
  
file_path: MONAI/tests/test_intensity_statsd.py
imports: from __future__ import annotations
  import sys
  import unittest
  import numpy
  import torch.multiprocessing
  from parameterized import parameterized
  from monai.data import DataLoader, Dataset
  from monai.transforms import IntensityStatsd
  from monai.utils.enums import PostFix
label_desc: Use image node_id 1 for calling the TestIntensityStatsd obj's underlying member method code with example usage: obj.test_value(input_param, data, meta_key, expected) without return types