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diff --git a/test/lisp/emulation/viper-tests.el b/test/lisp/emulation/viper-tests.el
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+;;; viper-tests.el --- tests for viper.
+
+;; Copyright (C) 2016 Free Software Foundation, Inc.
+
+;; 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/>.
+
+;;; Commentary:
+
+;;; Code:
+
+
+(require 'viper)
+
+(defun viper-test-undo-kmacro (kmacro)
+  "In a clean viper buffer, run KMACRO and return `buffer-string'.
+
+This function makes as many attempts as possible to clean up
+after itself, although it will leave a buffer called
+*viper-test-buffer* if it fails (this is deliberate!)."
+  (let (
+        ;; Viper just turns itself off during batch use.
+        (noninteractive nil)
+        ;; Switch off start up message or it will chew the key presses.
+        (viper-inhibit-startup-message 't)
+        ;; Select an expert-level for the same reason.
+        (viper-expert-level 5)
+        ;; viper loads this even with -q so make sure it's empty!
+        (viper-custom-file-name (make-temp-file "viper-tests" nil ".elc"))
+        (before-buffer (current-buffer)))
+    (unwind-protect
+        (progn
+          ;; viper-mode is essentially global, so set it here.
+          (viper-mode)
+          ;; We must switch to buffer because we are using a keyboard macro
+          ;; which appears to not go to the current-buffer but what ever is
+          ;; currently taking keyboard events. We use a named buffer because
+          ;; then we can see what it in it if it all goes wrong.
+          (switch-to-buffer
+           (get-buffer-create
+            "*viper-test-buffer*"))
+          (erase-buffer)
+          ;; The new buffer fails to enter vi state so set it.
+          (viper-change-state-to-vi)
+          ;; Run the macro.
+          (execute-kbd-macro kmacro)
+          (let ((rtn
+                 (buffer-substring-no-properties
+                  (point-min)
+                  (point-max))))
+            ;; Kill the buffer iff the macro succeeds.
+            (kill-buffer)
+            rtn))
+      ;; Switch everything off and restore the buffer.
+      (toggle-viper-mode)
+      (delete-file viper-custom-file-name)
+      (switch-to-buffer before-buffer))))
+
+(ert-deftest viper-test-go ()
+  "Test that this file is running."
+  (should t))
+
+(ert-deftest viper-test-fix ()
+  "Test that the viper kmacro fixture is working."
+  (should
+   (viper-test-undo-kmacro [])))
+
+(ert-deftest viper-test-undo-1 ()
+  "Test for VI like undo behavior.
+
+Insert 1, then 2 on consecutive lines, followed by undo. This
+should leave just 1 in the buffer.
+
+Test for Bug #22295"
+  (should
+   (equal
+    "1\n"
+    (viper-test-undo-kmacro
+     [
+      ?a
+      ?1
+      escape
+      ?o
+      ?2
+      escape
+      ?u
+      ]
+     ))))
+
+(ert-deftest viper-test-undo-2 ()
+  "Test for VI like undo behavior.
+
+Insert \"1 2 3 4 5\" then delete the 2, then the 4, and undo.
+Should restore the 4, but leave the 2 deleted.
+
+Test for Bug #22295"
+  (should
+   (equal
+    "1 3 4 5\n"
+    (viper-test-undo-kmacro
+     [
+      ?i
+      ?1 ?  ?2 ?  ?3 ?  ?4 ?  ?5
+      escape
+      ?F ?2 ?d ?w
+      ?w ?d ?w
+      ?u
+      ]))))
+
+(ert-deftest viper-test-undo-3 ()
+  "Test for VI like undo behavior.
+
+Insert \"1 2 3 4 5 6\", delete the 2, then the 3 4 and 5.
+Should restore the 3 4 and 5 but not the 2.
+
+Test for Bug #22295"
+  (should
+   (equal
+    "1 3 4 5 6\n"
+    (viper-test-undo-kmacro
+     [
+      ;; Insert this lot.
+      ?i ?1 ? ?2 ? ?3 ? ?4 ? ?5 ? ?6
+         escape
+         ;; Start of line.
+         ?0
+         ;; Move to 2, delete
+         ?w ?d ?w
+         ;; Delete 3 4 5
+         ?. ?. ?.
+         ;; Undo del 5, then
+         ?u ?. ?.
+         ]))))
+
+
+(ert-deftest viper-test-undo-4()
+  (should
+   (equal
+    ""
+    (viper-test-undo-kmacro
+     [
+      ?i ?1 escape
+         ?o ?2 escape
+         ?o ?3 escape
+         ?u ?. ?.
+         ])
+    )))
+
+;;; viper-tests.el ends here