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diff --git a/third_party/lisp/mime4cl/test/mime.lisp b/third_party/lisp/mime4cl/test/mime.lisp
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+;;; mime.lisp --- MIME regression tests
+
+;;; Copyright (C) 2012 by Walter C. Pelissero
+;;; Copyright (C) 2021-2023 by the TVL Authors
+
+;;; Author: Walter C. Pelissero <walter@pelissero.de>
+;;; Project: mime4cl
+
+;;; This library is free software; you can redistribute it and/or
+;;; modify it under the terms of the GNU Lesser General Public License
+;;; as published by the Free Software Foundation; either version 2.1
+;;; of the License, or (at your option) any later version.
+;;; This library 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
+;;; Lesser General Public License for more details.
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this library; if not, write to the Free
+;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+;;; 02111-1307 USA
+
+(in-package :mime4cl-tests)
+
+(defvar *samples-directory*
+  (merge-pathnames (make-pathname :directory '(:relative "samples"))
+                   #.(or *compile-file-pathname*
+                         *load-pathname*
+                         #P"")))
+
+(loop
+ for f in (directory (make-pathname :defaults *samples-directory*
+                                    :name :wild
+                                    :type "msg"))
+ for i from 1
+ do
+ (add-test (intern (format nil "MIME.~A" i))
+           `(let* ((orig (mime-message ,f))
+                   (dup (mime-message
+                         (with-output-to-string (out) (encode-mime-part orig out)))))
+              (mime= orig dup))
+           t))