new_contents: """
      This is mostly stolen from qtile's tests/scripts/window.py
  """
  from __future__ import print_function
  import os
  import sys
  import struct
  import time
  import xcffib
  import xcffib.xproto
  from xcffib.xproto import EventMask
  from xcffib.testing import XvfbTest
  
  class TestWindow(XvfbTest):
  
      def test_the_script(self):
          NAME = "one"
          for i in range(20):
              try:
                  conn = xcffib.connect(os.environ['DISPLAY'])
              except xcffib.ConnectionException:
                  time.sleep(0.1)
                  continue
              except Exception as v:
                  print("Error opening test window: ", type(v), v, file=sys.stderr)
                  sys.exit(1)
              break
          else:
              print("Could not open window on display %s" % (sys.argv[1]), file=sys.stderr)
              sys.exit(1)
  
          screen = conn.get_setup().roots[conn.pref_screen]
  
          window = conn.generate_id()
          background = conn.core.AllocColor(screen.default_colormap, 0x2828, 0x8383, 0xCECE).reply().pixel # Color "#2883ce"
          conn.core.CreateWindow(xcffib.CopyFromParent, window, screen.root,
                  100, 100, 100, 100, 1,
                  xcffib.xproto.WindowClass.InputOutput, screen.root_visual,
                  xcffib.xproto.CW.BackPixel | xcffib.xproto.CW.EventMask,
                  [background, xcffib.xproto.EventMask.StructureNotify | xcffib.xproto.EventMask.Exposure])
  
          conn.core.ChangeProperty(xcffib.xproto.PropMode.Replace,
                  window, xcffib.xproto.Atom.WM_NAME,
                  xcffib.xproto.Atom.STRING, 8, len(NAME),
                  NAME)
  
          wm_protocols = "WM_PROTOCOLS"
          wm_protocols = conn.core.InternAtom(0, len(wm_protocols), wm_protocols).reply().atom
  
          wm_delete_window = "WM_DELETE_WINDOW"
          wm_delete_window = conn.core.InternAtom(0, len(wm_delete_window), wm_delete_window).reply().atom
  
          conn.core.ChangeProperty(xcffib.xproto.PropMode.Replace,
                  window, wm_protocols,
                  xcffib.xproto.Atom.ATOM, 32, 1,
                  [wm_delete_window])
  
          conn.core.ConfigureWindow(window,
                  xcffib.xproto.ConfigWindow.X | xcffib.xproto.ConfigWindow.Y |
                  xcffib.xproto.ConfigWindow.Width | xcffib.xproto.ConfigWindow.Height |
                  xcffib.xproto.ConfigWindow.BorderWidth,
                  [0, 0, 100, 100, 1])
          conn.core.MapWindow(window)
          conn.flush()
          conn.core.ConfigureWindow(window,
                  xcffib.xproto.ConfigWindow.X | xcffib.xproto.ConfigWindow.Y |
                  xcffib.xproto.ConfigWindow.Width | xcffib.xproto.ConfigWindow.Height |
                  xcffib.xproto.ConfigWindow.BorderWidth,
                  [0, 0, 100, 100, 1])
  
          # now kill the window from the "wm" side via WM_DELETE_WINDOW protocol
          WM_PROTOCOLS = self.conn.core.InternAtom(False, len("WM_PROTOCOLS"), "WM_PROTOCOLS").reply().atom
          WM_DELETE_WINDOW = self.conn.core.InternAtom(False, len("WM_DELETE_WINDOW"), "WM_DELETE_WINDOW").reply().atom
          vals = [
              33,  # ClientMessageEvent
              32,  # Format
              0,
              window,
              WM_PROTOCOLS,
              WM_DELETE_WINDOW,
              xcffib.xproto.Time.CurrentTime,
              0,
              0,
              0,
          ]
          e = struct.pack('BBHII5I', *vals)
          self.conn.core.SendEvent(False, window, EventMask.NoEvent, e)
  
          self.conn.flush()
  
          while 1:
              conn.flush()
              event = conn.wait_for_event()
              if event.__class__ == xcffib.xproto.ClientMessageEvent:
                  atom = conn.core.GetAtomName(event.type).reply().name.to_string()
                  print(atom)
                  if atom == "WM_PROTOCOLS":
                      break
          # This test passes if it gets all the way here without dying :-)
  
subject: add crazy qtile test script