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diff --git a/test/src/coding-tests.el b/test/src/coding-tests.el
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+++ b/test/src/coding-tests.el
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+;;; coding-tests.el --- tests for text encoding and decoding
+
+;; Copyright (C) 2015-2016 Free Software Foundation, Inc.
+
+;; Author: Eli Zaretskii <eliz@gnu.org>
+
+;; 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)
+
+;; Directory to hold test data files.
+(defvar coding-tests-workdir
+  (expand-file-name "coding-tests" temporary-file-directory))
+
+;; Remove all generated test files.
+(defun coding-tests-remove-files ()
+  (delete-directory coding-tests-workdir t))
+
+(ert-deftest ert-test-coding-bogus-coding-systems ()
+  (unwind-protect
+      (let (test-file)
+        (or (file-directory-p coding-tests-workdir)
+            (mkdir coding-tests-workdir t))
+        (setq test-file (expand-file-name "nonexistent" coding-tests-workdir))
+        (if (file-exists-p test-file)
+            (delete-file test-file))
+        (should-error
+         (let ((coding-system-for-read 'bogus))
+           (insert-file-contents test-file)))
+        ;; See bug #21602.
+        (setq test-file (expand-file-name "writing" coding-tests-workdir))
+        (should-error
+         (let ((coding-system-for-write (intern "\"us-ascii\"")))
+           (write-region "some text" nil test-file))))
+    (coding-tests-remove-files)))
+
+;; See issue #5251.
+(ert-deftest ert-test-unibyte-buffer-dos-eol-decode ()
+  (with-temp-buffer
+    (set-buffer-multibyte nil)
+    (insert (encode-coding-string "あ" 'euc-jp) "\xd" "\n")
+    (decode-coding-region (point-min) (point-max) 'euc-jp-dos)
+    (should-not (string-match-p "\^M" (buffer-string)))))