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diff --git a/test/lisp/ansi-color-tests.el b/test/lisp/ansi-color-tests.el
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+;;; ansi-color-tests.el --- Test suite for ansi-color  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2020 Free Software Foundation, Inc.
+
+;; Author: Pablo Barbáchano <pablob@amazon.com>
+;; Keywords: ansi
+
+;; 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 'ansi-color)
+
+(defvar test-strings '(("\e[33mHello World\e[0m" . "Hello World")
+                       ("\e[1m\e[3m\e[5mbold italics blink\e[0m" . "bold italics blink")))
+
+(ert-deftest ansi-color-apply-on-region-test ()
+    (dolist (pair test-strings)
+      (with-temp-buffer
+        (insert (car pair))
+        (ansi-color-apply-on-region (point-min) (point-max))
+        (should (equal (buffer-string) (cdr pair)))
+        (should (not (equal (overlays-at (point-min)) nil))))))
+
+(ert-deftest ansi-color-apply-on-region-preserving-test ()
+    (dolist (pair test-strings)
+      (with-temp-buffer
+        (insert (car pair))
+        (ansi-color-apply-on-region (point-min) (point-max) t)
+        (should (equal (buffer-string) (car pair))))))
+
+(provide 'ansi-color-tests)
+
+;;; ansi-color-tests.el ends here