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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Richard Sent <richard@freakingpenguin.com>.
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu tests sddm)
+  #:use-module (gnu bootloader)
+  #:use-module (gnu bootloader grub)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages ocr)
+  #:use-module (gnu packages xorg)
+  #:use-module (gnu services)
+  #:use-module (gnu services desktop)
+  #:use-module (gnu services sddm)
+  #:use-module (gnu services xorg)
+  #:use-module (gnu system)
+  #:use-module (gnu system vm)
+  #:use-module (gnu tests)
+  #:use-module (guix gexp)
+  #:use-module (guix modules)
+  #:use-module (srfi srfi-1)
+  #:export (%test-sddm))
+
+(define %sddm-os
+  (operating-system
+    (inherit %simple-os)
+    (services
+     (cons* (service sddm-service-type)
+            (modify-services %desktop-services
+              (delete gdm-service-type))))))
+
+(define (run-sddm-test)
+  "Run tests in %SDDM-OS."
+
+  (define os (marionette-operating-system
+              %sddm-os
+              #:imported-modules (source-module-closure
+                                  '((gnu services herd)))))
+
+  (define vm (virtual-machine
+              (operating-system os)
+              ;; Test may nondeterministically fail with default memory size.
+              (memory-size 1024)))
+
+  (define test
+    (with-imported-modules (source-module-closure
+                            '((gnu build marionette)))
+      #~(begin
+          (use-modules (gnu build marionette)
+                       (srfi srfi-26)
+                       (srfi srfi-64))
+
+          (let ((marionette (make-marionette (list #$vm))))
+
+            (test-runner-current (system-test-runner #$output))
+            (test-begin "sddm")
+
+            (test-assert "service is running"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  ;; sddm's shepherd service is called xorg-server
+                  (start-service 'xorg-server))
+               marionette))
+
+            (test-assert "service can be stopped"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  (stop-service 'xorg-server))
+               marionette))
+
+            (test-assert "service can be restarted"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  (restart-service 'xorg-server))
+               marionette))
+
+            (test-assert "login screen up"
+              ;; GNU Ocrad fails to recognize any text, so use Tesseract.
+              (wait-for-screen-text marionette
+                                    ;; Login button not recognized, use SDDM's
+                                    ;; welcome message.
+                                    (cut string-contains <> (string-append "Welcome to "
+                                                                           #$(operating-system-host-name %sddm-os)))
+                                    #:ocr #$(file-append tesseract-ocr
+                                                         "/bin/tesseract")
+                                    #:timeout 60))
+
+            (test-end)))))
+
+  (gexp->derivation "sddm-test" test))
+
+(define %test-sddm
+  (system-test
+   (name "sddm")
+   (description "Basic tests for the SDDM service.")
+   (value (run-sddm-test))))