code: def test_positive_bijector_setting(value: str) -> None:
      set_default_positive_bijector(value)
      assert default_positive_bijector() == value.lower()
  
imports: import os
  from typing import Any, Callable, Iterable
  from unittest import mock
  import numpy
  import pytest
  import tensorflow
  import gpflow
  from gpflow.base import TensorData
  from gpflow.config import config, default_float, default_int, default_jitter, default_likelihood_positive_minimum, default_positive_bijector, default_positive_minimum, default_summary_fmt, set_config, set_default_float, set_default_int, set_default_jitter, set_default_likelihood_positive_minimum, set_default_positive_bijector, set_default_positive_minimum, set_default_summary_fmt
  from gpflow.utilities import to_default_float, to_default_int
label_desc: Use image node_id 9 for calling a global function with example usage: test_positive_bijector_setting(value) without return types