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