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diff --git a/tests/services/file-sharing.scm b/tests/services/file-sharing.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Simon South <simon@simonsouth.net>
+;;;
+;;; 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 (tests services file-sharing)
+  #:use-module (gnu services file-sharing)
+  #:use-module (srfi srfi-64))
+
+;;; Tests for the (gnu services file-sharing) module.
+
+(test-begin "file-sharing")
+
+
+;;;
+;;; Transmission Daemon.
+;;;
+
+(define %transmission-salt-length 8)
+
+(define (valid-transmission-salt? salt)
+    (and (string? salt)
+         (eqv? (string-length salt) %transmission-salt-length)))
+
+(test-assert "transmission-random-salt"
+  (valid-transmission-salt? (transmission-random-salt)))
+
+(test-equal "transmission-password-hash, typical values"
+  "{ef6fba106cdef3aac64d1410090cae353cbecde53ceVVQO2"
+  (transmission-password-hash "transmission" "3ceVVQO2"))
+
+(test-equal "transmission-password-hash, empty password"
+  "{820f816515d8969d058d07a1de018650619ee7ffCp.I5SWg"
+  (transmission-password-hash "" "Cp.I5SWg"))
+
+(test-error "transmission-password-hash, salt value too short"
+            (transmission-password-hash
+             "transmission"
+             (make-string (- %transmission-salt-length 1) #\a)))
+
+(test-error "transmission-password-hash, salt value too long"
+            (transmission-password-hash
+             "transmission"
+             (make-string (+ %transmission-salt-length 1) #\a)))
+
+(test-end "file-sharing")