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diff --git a/gnu/tests/pam.scm b/gnu/tests/pam.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Bruno Victal <mirai@makinata.eu>
+;;;
+;;; 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 pam)
+  #:use-module (gnu tests)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu system)
+  #:use-module (gnu system pam)
+  #:use-module (gnu system vm)
+  #:use-module (guix gexp)
+  #:use-module (ice-9 format)
+  #:export (%test-pam-limits
+            %test-pam-limits-deprecated))
+
+
+;;;
+;;; pam-limits-service-type
+;;;
+
+(define pam-limit-entries
+  (list
+   (pam-limits-entry "@realtime" 'both 'rtprio 99)
+   (pam-limits-entry "@realtime" 'both 'memlock 'unlimited)))
+
+(define (run-test-pam-limits config)
+  "Run tests in a os with pam-limits-service-type configured."
+  (define os
+    (marionette-operating-system
+     (simple-operating-system
+      (service pam-limits-service-type config))))
+
+  (define vm
+    (virtual-machine os))
+
+  (define name (format #f "pam-limit-service~:[~;-deprecated~]"
+                       (file-like? config)))
+
+  (define test
+    (with-imported-modules '((gnu build marionette))
+      #~(begin
+          (use-modules (gnu build marionette)
+                       (srfi srfi-64))
+
+          (let ((marionette (make-marionette (list #$vm))))
+
+            (test-runner-current (system-test-runner #$output))
+
+            (test-begin #$name)
+
+            (test-assert "/etc/security/limits.conf ready"
+              (wait-for-file "/etc/security/limits.conf" marionette))
+
+            (test-equal "/etc/security/limits.conf content matches"
+              #$(string-join (map pam-limits-entry->string pam-limit-entries)
+                             "\n" 'suffix)
+              (marionette-eval
+               '(call-with-input-file "/etc/security/limits.conf"
+                  get-string-all)
+               marionette))
+
+            (test-end)))))
+
+  (gexp->derivation (string-append name "-test") test))
+
+(define %test-pam-limits
+  (system-test
+   (name "pam-limits-service")
+   (description "Test that pam-limits-service can serialize its config
+(as a list) to @file{limits.conf}.")
+   (value (run-test-pam-limits pam-limit-entries))))
+
+(define %test-pam-limits-deprecated
+  (system-test
+   (name "pam-limits-service-deprecated")
+   (description "Test that pam-limits-service can serialize its config
+(as a file-like object) to @file{limits.conf}.")
+   (value (run-test-pam-limits
+           (plain-file "limits.conf"
+                       (string-join (map pam-limits-entry->string
+                                         pam-limit-entries)
+                                    "\n" 'suffix))))))