code: def test_glibc_version_string_none(monkeypatch):
      monkeypatch.setattr(
          _manylinux, "_glibc_version_string", lambda: None
      )
      assert not _is_compatible("any", (2, 4))
  
imports: import os
  import pathlib
  import platform
  import sys
  import types
  import warnings
  import pretend
  import pytest
  from packaging import _manylinux
  from packaging._manylinux import _get_glibc_version, _glibc_version_string, _glibc_version_string_confstr, _glibc_version_string_ctypes, _is_compatible, _parse_elf, _parse_glibc_version
label_desc: Use image node_id 16 for calling a global function with example usage: test_glibc_version_string_none(monkeypatch) without return types