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diff --git a/tests/processes.scm b/tests/processes.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 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-processes)
+  #:use-module (guix scripts processes)
+  #:use-module (guix store)
+  #:use-module (guix derivations)
+  #:use-module (guix packages)
+  #:use-module (guix gexp)
+  #:use-module ((guix utils) #:select (call-with-temporary-directory))
+  #:use-module (gnu packages bootstrap)
+  #:use-module (guix tests)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64)
+  #:use-module (rnrs bytevectors)
+  #:use-module (rnrs io ports)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 threads))
+
+(test-begin "processes")
+
+(test-assert "not a client"
+  (not (find (lambda (session)
+               (= (getpid)
+                  (process-id (daemon-session-client session))))
+             (daemon-sessions))))
+
+(test-assert "client"
+  (with-store store
+    (let* ((session (find (lambda (session)
+                            (= (getpid)
+                               (process-id (daemon-session-client session))))
+                          (daemon-sessions)))
+           (daemon  (daemon-session-process session)))
+      (and (kill (process-id daemon) 0)
+           (string-suffix? "guix-daemon" (first (process-command daemon)))))))
+
+(test-assert "client + lock"
+  (with-store store
+    (call-with-temporary-directory
+     (lambda (directory)
+       (let* ((token1  (string-append directory "/token1"))
+              (token2  (string-append directory "/token2"))
+              (exp     #~(begin #$(random-text)
+                                (mkdir #$token1)
+                                (let loop ()
+                                  (unless (file-exists? #$token2)
+                                    (sleep 1)
+                                    (loop)))
+                                (mkdir #$output)))
+              (guile   (package-derivation store %bootstrap-guile))
+              (drv     (run-with-store store
+                         (gexp->derivation "foo" exp
+                                           #:guile-for-build guile)))
+              (thread  (call-with-new-thread
+                        (lambda ()
+                          (build-derivations store (list drv)))))
+              (_       (let loop ()
+                         (unless (file-exists? token1)
+                           (usleep 200)
+                           (loop))))
+              (session (find (lambda (session)
+                               (= (getpid)
+                                  (process-id (daemon-session-client session))))
+                             (daemon-sessions)))
+              (locks   (daemon-session-locks-held (pk 'session session))))
+         (call-with-output-file token2 (const #t))
+         (equal? (list (string-append (derivation->output-path drv) ".lock"))
+                 locks))))))
+
+(test-end "processes")