nixos/qui: init tests

nixos/tests/all-tests.nix

@@ -1314,6 +1314,7 @@ in
   qtile = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./qtile/default.nix;
   qtile-extras = runTestOn [ "x86_64-linux" "aarch64-linux" ] ./qtile-extras/default.nix;
   quake3 = runTest ./quake3.nix;
+  qui = runTest ./qui.nix;
   quicktun = runTest ./quicktun.nix;
   quickwit = runTest ./quickwit.nix;
   rabbitmq = runTest ./rabbitmq.nix;

nixos/tests/qui.nix

@@ -0,0 +1,47 @@
+{ lib, ... }:
+
+{
+  name = "qui";
+  meta.maintainers = with lib.maintainers; [ undefined-landmark ];
+
+  nodes.machine =
+    { pkgs, ... }:
+    let
+      # We create this secret in the Nix store (making it readable by everyone).
+      # DO NOT DO THIS OUTSIDE OF TESTS!!
+      testSecretFile = pkgs.writeText "session_secret" "not-secret";
+    in
+    {
+      services.qui = {
+        enable = true;
+        secretFile = testSecretFile;
+      };
+
+      # Use port other than default to test if settings options work.
+      specialisation.settingsPort.configuration = {
+        services.qui = {
+          enable = true;
+          secretFile = testSecretFile;
+          settings.port = 7777;
+        };
+      };
+    };
+
+  testScript =
+    { nodes, ... }:
+    let
+      settingsPort = "${nodes.machine.system.build.toplevel}/specialisation/settingsPort";
+    in
+    # python
+    ''
+      def test_webui(port):
+        machine.wait_for_unit("qui.service")
+        machine.wait_for_open_port(port)
+        machine.wait_until_succeeds(f"curl --fail http://localhost:{port}")
+
+      test_webui(7476)
+
+      machine.succeed("${settingsPort}/bin/switch-to-configuration test")
+      test_webui(7777)
+    '';
+}

pkgs/by-name/qu/qui/package.nix

@@ -3,6 +3,7 @@
   buildGoModule,
   fetchFromGitHub,
   stdenvNoCC,
+  nixosTests,
   nix-update-script,
   nodejs,
   pnpm_9,
@@ -72,11 +73,14 @@ buildGoModule (finalAttrs: {
   versionCheckProgramArg = "version";
   doInstallCheck = true;
 
-  passthru.updateScript = nix-update-script {
-    extraArgs = [
-      "--subpackage"
-      "qui-web"
-    ];
+  passthru = {
+    updateScript = nix-update-script {
+      extraArgs = [
+        "--subpackage"
+        "qui-web"
+      ];
+    };
+    tests.testService = nixosTests.qui;
   };
 
   meta = {