code: def test_show_without_viewers():
      viewers = ImageShow._viewers
      ImageShow._viewers = []
  
      with hopper() as im:
          assert not ImageShow.show(im)
  
      ImageShow._viewers = viewers
  
file_path: pillow/Tests/test_imageshow.py
imports: from __future__ import annotations
  import pytest
  from PIL import Image, ImageShow
  from .helper import hopper, is_win32, on_ci
label_desc: Use image node_id 5 for calling a global function with example usage: test_show_without_viewers() without return types