code: def test_warn(self, input_param, input_data, expected_val):
      with self.assertWarns(Warning):
          result = RandHistogramShift(**input_param)(**input_data)
          assert_allclose(result, expected_val, type_test="tensor")
  
file_path: MONAI/tests/test_rand_histogram_shift.py
imports: from __future__ import annotations
  import unittest
  import numpy
  import torch
  from parameterized import parameterized
  from monai.transforms import RandHistogramShift
  from tests.utils import TEST_NDARRAYS, assert_allclose
label_desc: Use image node_id 3 for calling the TestRandHistogramShift obj's underlying member method code with example usage: obj.test_warn(input_param, input_data, expected_val) without return types