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diff --git a/test/lisp/textmodes/dns-mode-tests.el b/test/lisp/textmodes/dns-mode-tests.el
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+++ b/test/lisp/textmodes/dns-mode-tests.el
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+;;; dns-mode-tests.el --- Test suite for dns-mode  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017 Free Software Foundation, Inc.
+
+;; Author: Peder O. Klingenberg <peder@klingenberg.no>
+;; Keywords: dns zone
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 Emacs 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 Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'dns-mode)
+
+;;; IPv6 reverse zones
+(ert-deftest dns-mode-ipv6-conversion ()
+  (let ((address "2001:db8::42"))
+    (should (equal (dns-mode-reverse-and-expand-ipv6 address)
+                   "2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa. "))
+    (should (equal (dns-mode-reverse-and-expand-ipv6 address 32)
+                   "8.b.d.0.1.0.0.2.ip6.arpa. "))
+    (should (equal (dns-mode-reverse-and-expand-ipv6 address -112)
+                   "2.4.0.0 "))))
+
+(ert-deftest dns-mode-ipv6-text-replacement ()
+  (let ((address "2001:db8::42/32"))
+    (with-temp-buffer
+      ;; Conversion with point directly after address
+      (insert address)
+      (dns-mode-ipv6-to-nibbles nil)
+      (should (equal (buffer-string) "8.b.d.0.1.0.0.2.ip6.arpa. "))
+      ;; Kill ring contains the expected
+      (erase-buffer)
+      (yank)
+      (should (equal (buffer-string) address))
+      ;; Point at beginning of address (and prefix arg to command)
+      (goto-char (point-min))
+      (dns-mode-ipv6-to-nibbles t)
+      (should (equal (buffer-string) "2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0 "))
+      ;; Point separated from address by whitespace
+      (erase-buffer)
+      (insert address)
+      (insert " ")
+      (dns-mode-ipv6-to-nibbles nil)
+      (should (equal (buffer-string) "8.b.d.0.1.0.0.2.ip6.arpa.  ")))))