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diff --git a/test/lisp/progmodes/ps-mode-tests.el b/test/lisp/progmodes/ps-mode-tests.el
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+++ b/test/lisp/progmodes/ps-mode-tests.el
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+;;; ps-mode-tests.el --- Test suite for ps-mode
+
+;; Copyright (C) 2019 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 <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'ert)
+(require 'ps-mode)
+
+(ert-deftest ps-mode-test-octal-region ()
+  (with-temp-buffer
+    (set-buffer-multibyte nil)
+    (insert "foo" #x90 #x91 #x92 "bar")
+    (ps-mode-octal-region (point-min) (point-max))
+    (should (equal (buffer-string)
+                   "foo\\220\\221\\222bar"))))
+
+(provide 'ps-mode-tests)
+
+;;; ps-mode-tests.el ends here