anchor.diff:    machine.imports = [ ./common/user-account.nix ./common/x11.nix ];
     machine.virtualisation.memorySize = 2047;
     machine.test-support.displayManager.auto.user = user;
  -  machine.environment.systemPackages = [ chromiumPkg ];
  +  machine.environment = {
  +    systemPackages = [ chromiumPkg ];
  +    variables."XAUTHORITY" = "/home/alice/.Xauthority";
  +  };
   
     startupHTML = pkgs.writeText "chromium-startup.html" ''
       <!DOCTYPE html>
  
positive.code: 
  
      @contextmanager
      def test_new_win(description):
          create_new_win()
          with machine.nested(description):
              yield
          # Close the newly created window:
          machine.send_key("ctrl-w")
  
  
negative.code: 
      machine.screenshot("startup_done")
  
      with test_new_win("sandbox_info", "chrome://sandbox", "Sandbox Status") as clipboard:
          filters = [
              "layer 1 sandbox.*namespace",
              "pid namespaces.*yes",
  