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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 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 (tests services vpn)
+  #:use-module (gnu packages vpn)
+  #:use-module (gnu services vpn)
+  #:use-module (guix gexp)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-64))
+
+;;; Commentary:
+;;;
+;;; Unit tests for the (gnu services vpn) module.
+;;;
+;;; Code:
+
+;;; Access some internals for whitebox testing.
+(define ipv4-address? (@@ (gnu services vpn) ipv4-address?))
+(define ipv6-address? (@@ (gnu services vpn) ipv6-address?))
+(define host-name? (@@ (gnu services vpn) host-name?))
+(define endpoint-host-names
+  (@@ (gnu services vpn) endpoint-host-names))
+
+(test-begin "vpn-services")
+
+(test-assert "ipv4-address?"
+  (every ipv4-address?
+         (list "192.95.5.67:1234"
+               "10.0.0.1")))
+
+(test-assert "ipv6-address?"
+  (every ipv6-address?
+         (list "[2001:db8::c05f:543]:2468"
+               "2001:db8::c05f:543"
+               "2001:db8:855b:0000:0000:0567:5673:23b5"
+               "2001:db8:855b::0567:5673:23b5")))
+
+(define %wireguard-peers
+  (list (wireguard-peer
+         (name "dummy1")
+         (public-key "VlesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XjoalC8=")
+         (endpoint "some.dynamic-dns.service:53281")
+         (allowed-ips '()))
+        (wireguard-peer
+         (name "dummy2")
+         (public-key "AlesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XgoalC9=")
+         (endpoint "example.org")
+         (allowed-ips '()))
+        (wireguard-peer
+         (name "dummy3")
+         (public-key "BlesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XgoalC7=")
+         (endpoint "10.0.0.7:7777")
+         (allowed-ips '()))
+        (wireguard-peer
+         (name "dummy4")
+         (public-key "ClesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XgoalC6=")
+         (endpoint "[2345:0425:2CA1::0567:5673:23b5]:44444")
+         (allowed-ips '()))))
+
+(test-equal "endpoint-host-names"
+  ;; The first element of the pair the public Wireguard key associated to a
+  ;; host name.
+  '(("VlesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XjoalC8=" .
+     "some.dynamic-dns.service:53281")
+    ("AlesLiEB5BFd//OD2ILKXviolfz+hodG6uZ+XgoalC9=" .
+     "example.org"))
+  (endpoint-host-names %wireguard-peers))
+
+(test-end "vpn-services")