Add XMonad test

nixos/release-combined.nix

@@ -115,6 +115,7 @@ in rec {
         (all nixos.tests.slim)
         (all nixos.tests.udisks2)
         (all nixos.tests.xfce)
+        (all nixos.tests.xmonad)
 
         nixpkgs.tarball
         (all allSupportedNixpkgs.emacs)

nixos/release.nix

@@ -312,6 +312,7 @@ in rec {
   tests.virtualbox = callSubTests tests/virtualbox.nix { system = "x86_64-linux"; };
   tests.wordpress = callTest tests/wordpress.nix {};
   tests.xfce = callTest tests/xfce.nix {};
+  tests.xmonad = callTest tests/xmonad.nix {};
 
 
   /* Build a bunch of typical closures so that Hydra can keep track of

nixos/tests/xmonad.nix

@@ -0,0 +1,28 @@
+import ./make-test.nix ({ pkgs, ...} : {
+  name = "xmonad";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ nequissimus ];
+  };
+
+  machine = { lib, pkgs, ... }: {
+    imports = [ ./common/x11.nix ./common/user-account.nix ];
+    services.xserver.displayManager.auto.user = "alice";
+    services.xserver.windowManager.default = lib.mkForce "xmonad";
+    services.xserver.windowManager.xmonad = {
+      enable = true;
+      enableContribAndExtras = true;
+      extraPackages = with pkgs.haskellPackages; haskellPackages: [ xmobar ];
+    };
+  };
+
+  testScript = { nodes, ... }: ''
+    $machine->waitForX;
+    $machine->waitForFile("/home/alice/.Xauthority");
+    $machine->succeed("xauth merge ~alice/.Xauthority");
+    $machine->sleep(3);
+    $machine->sendKeys("alt-shift-ret");
+    $machine->waitForWindow(qr/machine.*alice/);
+    $machine->sleep(1);
+    $machine->screenshot("terminal");
+  '';
+})