old_contents: from bt import backend_to_check
  from pyscreenshot.util import platform_is_linux
  
  if not platform_is_linux():
  
      def test_pil():
          backend_to_check("pil")
  
new_contents: from bt import backend_to_check
  from pyscreenshot.util import (
      platform_is_linux,
      platform_is_osx,
      platform_is_win,
      use_x_display,
  )
  
  ok = False
  if platform_is_osx() and not use_x_display():
      ok = True
  if platform_is_linux() and use_x_display():
      ok = True
  if platform_is_win():
      ok = True
  
  if ok:
  
      def test_pil():
          backend_to_check("pil")
  
subject: enable test_pil() on linux