code: def test_one_range_input(self, class_args, expected):
      bias_field = RandBiasField(**class_args)
      img = np.ones([1, 2, 2])
      output = bias_field(img)
      np.testing.assert_allclose(
          output, expected.astype(bias_field.dtype), rtol=1e-3
      )
  
file_path: MONAI/tests/test_rand_bias_field.py
imports: from __future__ import annotations
  import unittest
  import numpy
  import torch
  from parameterized import parameterized
  from monai.transforms import RandBiasField
  from tests.utils import TEST_NDARRAYS
label_desc: Use image node_id 3 for calling the TestRandBiasField obj's underlying member method code with example usage: obj.test_one_range_input(class_args, expected) without return types