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+;; test-lib.el --- auxiliary stuff for Notmuch Emacs tests.
+;;
+;; Copyright © Carl Worth
+;; Copyright © David Edmondson
+;;
+;; This file is part of Notmuch test suit.
+;;
+;; Notmuch 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.
+;;
+;; Notmuch 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 Notmuch.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;; Authors: Dmitry Kurochkin <dmitry.kurochkin@gmail.com>
+
+(defun visible-buffer-string ()
+  "Same as `buffer-string', but excludes invisible text."
+  (visible-buffer-substring (point-min) (point-max)))
+
+(defun visible-buffer-substring (start end)
+  "Same as `buffer-substring', but excludes invisible text."
+  (let (str)
+    (while (< start end)
+      (let ((next-pos (next-char-property-change start end)))
+	(when (not (invisible-p start))
+	  (setq str (concat str (buffer-substring start next-pos))))
+	(setq start next-pos)))
+    str))