nixosTests.xfce4-14: init

This is pretty much identical to the xfce test we currently have.

nixos/release-combined.nix

@@ -136,6 +136,7 @@ in rec {
         (all nixos.tests.switchTest)
         (all nixos.tests.udisks2)
         (all nixos.tests.xfce)
+        (all nixos.tests.xfce4-14)
 
         nixpkgs.tarball
         (all allSupportedNixpkgs.emacs)

nixos/tests/all-tests.nix

@@ -273,6 +273,7 @@ in
   xautolock = handleTest ./xautolock.nix {};
   xdg-desktop-portal = handleTest ./xdg-desktop-portal.nix {};
   xfce = handleTest ./xfce.nix {};
+  xfce4-14 = handleTest ./xfce4-14.nix {};
   xmonad = handleTest ./xmonad.nix {};
   xrdp = handleTest ./xrdp.nix {};
   xss-lock = handleTest ./xss-lock.nix {};

nixos/tests/xfce4-14.nix

@@ -0,0 +1,33 @@
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "xfce4-14";
+
+  machine =
+    { pkgs, ... }:
+
+    { imports = [ ./common/user-account.nix ];
+
+      services.xserver.enable = true;
+
+      services.xserver.displayManager.auto.enable = true;
+      services.xserver.displayManager.auto.user = "alice";
+
+      services.xserver.desktopManager.xfce4-14.enable = true;
+    };
+
+  testScript =
+    ''
+      $machine->waitForX;
+      $machine->waitForFile("/home/alice/.Xauthority");
+      $machine->succeed("xauth merge ~alice/.Xauthority");
+      $machine->waitForWindow(qr/xfce4-panel/);
+      $machine->sleep(10);
+
+      # Check that logging in has given the user ownership of devices.
+      $machine->succeed("getfacl /dev/snd/timer | grep -q alice");
+
+      $machine->succeed("su - alice -c 'DISPLAY=:0.0 xfce4-terminal &'");
+      $machine->waitForWindow(qr/Terminal/);
+      $machine->sleep(10);
+      $machine->screenshot("screen");
+    '';
+})