xterm: Add test

nixos/tests/all-tests.nix

@@ -388,6 +388,7 @@ in
   xmonad = handleTest ./xmonad.nix {};
   xrdp = handleTest ./xrdp.nix {};
   xss-lock = handleTest ./xss-lock.nix {};
+  xterm = handleTest ./xterm.nix {};
   yabar = handleTest ./yabar.nix {};
   yggdrasil = handleTest ./yggdrasil.nix {};
   zfs = handleTest ./zfs.nix {};

nixos/tests/xterm.nix

@@ -0,0 +1,23 @@
+import ./make-test-python.nix ({ pkgs, ...} : {
+  name = "xterm";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ nequissimus ];
+  };
+
+  machine = { pkgs, ... }:
+    {
+      imports = [ ./common/x11.nix ];
+      services.xserver.desktopManager.xterm.enable = false;
+    };
+
+  testScript =
+    ''
+      machine.wait_for_x()
+      machine.succeed("DISPLAY=:0 xterm -title testterm -class testterm -fullscreen &")
+      machine.sleep(2)
+      machine.send_chars("echo $XTERM_VERSION >> /tmp/xterm_version\n")
+      machine.wait_for_file("/tmp/xterm_version")
+      assert "${pkgs.xterm.version}" in machine.succeed("cat /tmp/xterm_version")
+      machine.screenshot("window")
+    '';
+})