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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.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 lightdm)
+  #:use-module (gnu bootloader)
+  #:use-module (gnu bootloader grub)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages ocr)
+  #:use-module (gnu packages ratpoison)
+  #:use-module (gnu packages vnc)
+  #:use-module (gnu packages xorg)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu services dbus)
+  #:use-module (gnu services desktop)
+  #:use-module (gnu services networking)
+  #:use-module (gnu services lightdm)
+  #:use-module (gnu services ssh)
+  #:use-module (gnu services xorg)
+  #:use-module (gnu system)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system shadow)
+  #:use-module (gnu system vm)
+  #:use-module (gnu tests)
+  #:use-module (guix gexp)
+  #:use-module (guix modules)
+  #:use-module (srfi srfi-1)
+  #:export (%test-lightdm))
+
+(define minimal-desktop-services
+  (list polkit-wheel-service
+        (service upower-service-type)
+        (accountsservice-service)
+        (service polkit-service-type)
+        (elogind-service)
+        (dbus-service)
+        x11-socket-directory-service))
+
+(define %lightdm-os
+  (operating-system
+    (inherit %simple-os)
+    (packages (cons* ocrad ratpoison xterm %base-packages))
+    (services
+     (cons* (service lightdm-service-type
+                     (lightdm-configuration
+                      (allow-empty-passwords? #t)
+                      (debug? #t)
+                      (xdmcp? #t)
+                      (vnc-server? #t)
+                      (vnc-server-command
+                       (file-append tigervnc-server "/bin/Xvnc"
+                                    "  -SecurityTypes None"))
+                      (greeters (list (lightdm-gtk-greeter-configuration
+                                       (allow-debugging? #t))))
+                      (seats (list (lightdm-seat-configuration
+                                    (name "*")
+                                    (user-session "ratpoison"))))))
+
+            ;; For debugging.
+            (service dhcp-client-service-type)
+            (service openssh-service-type
+                     (openssh-configuration
+                      (permit-root-login #t)
+                      (allow-empty-passwords? #t)))
+            (append minimal-desktop-services
+                    (remove (lambda (service)
+                              (eq? (service-kind service) guix-service-type))
+                            %base-services))))))
+
+(define (run-lightdm-test)
+  "Run tests in %LIGHTDM-OS."
+
+  (define os (marionette-operating-system
+              %lightdm-os
+              #:imported-modules (source-module-closure
+                                  '((gnu services herd)))))
+
+  (define vm (virtual-machine os))
+
+  (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 "lightdm")
+
+            (test-assert "service is running"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  (start-service 'lightdm))
+               marionette))
+
+            (test-assert "service can be stopped"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  (stop-service 'lightdm))
+               marionette))
+
+            (test-assert "service can be restarted"
+              (marionette-eval
+               '(begin
+                  (use-modules (gnu services herd))
+                  (restart-service 'lightdm))
+               marionette))
+
+            (test-assert "login screen is displayed"
+              ;; GNU Ocrad fails to recognize the "Log In" button text, so use
+              ;; Tesseract.
+              (wait-for-screen-text marionette
+                                    (cut string-contains <> "Log In")
+                                    #:ocr #$(file-append tesseract-ocr
+                                                         "/bin/tesseract")))
+
+            (test-assert "can connect to TCP port 5900 on IPv4"
+              (wait-for-tcp-port 5900 marionette))
+
+            ;; The VNC server fails to listen to IPv6 due to "Error binding to
+            ;; address [::]:5900: Address already in use" (see:
+            ;; https://github.com/canonical/lightdm/issues/266).
+            (test-expect-fail 1)
+            (test-assert "can connect to TCP port 5900 on IPv6"
+              (wait-for-tcp-port 5900 marionette
+                                 #:address
+                                 `(make-socket-address
+                                   AF_INET6
+                                   (inet-pton AF_INET6 "::1")
+                                   5900)))
+
+            (test-end)))))
+
+  (gexp->derivation "lightdm-test" test))
+
+(define %test-lightdm
+  (system-test
+   (name "lightdm")
+   (description "Basic tests for the LightDM service.")
+   (value (run-lightdm-test))))