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diff --git a/tests/system.scm b/tests/system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; 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 (test-system)
+  #:use-module (gnu)
+  #:use-module (guix store)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64))
+
+;; Test the (gnu system) module.
+
+(define %root-fs
+  (file-system
+    (device "my-root")
+    (title 'label)
+    (mount-point "/")
+    (type "ext4")))
+
+(define %os
+  (operating-system
+    (host-name "komputilo")
+    (timezone "Europe/Berlin")
+    (locale "en_US.utf8")
+    (bootloader (grub-configuration (device "/dev/sdX")))
+    (file-systems (cons %root-fs %base-file-systems))
+
+    (users %base-user-accounts)))
+
+(test-begin "system")
+
+(test-assert "operating-system-store-file-system"
+  ;; %BASE-FILE-SYSTEMS defines a bind-mount for /gnu/store, but this
+  ;; shouldn't be a problem.
+  (eq? %root-fs
+       (operating-system-store-file-system %os)))
+
+(test-assert "operating-system-store-file-system, prefix"
+  (let* ((gnu (file-system
+                (device "foobar")
+                (mount-point (dirname (%store-prefix)))
+                (type "ext5")))
+         (os  (operating-system
+                (inherit %os)
+                (file-systems (cons* gnu %root-fs
+                                     %base-file-systems)))))
+    (eq? gnu (operating-system-store-file-system os))))
+
+(test-assert "operating-system-store-file-system, store"
+  (let* ((gnu (file-system
+                (device "foobar")
+                (mount-point (%store-prefix))
+                (type "ext5")))
+         (os  (operating-system
+                (inherit %os)
+                (file-systems (cons* gnu %root-fs
+                                     %base-file-systems)))))
+    (eq? gnu (operating-system-store-file-system os))))
+
+(test-end)
+
+
+(exit (= (test-runner-fail-count (test-runner-current)) 0))