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;;; buffer-tests.el --- tests for buffer.c functions -*- lexical-binding: t -*-
;; Copyright (C) 2015-2016 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 <http://www.gnu.org/licenses/>.
;;; Code:
(require 'ert)
(ert-deftest overlay-modification-hooks-message-other-buf ()
"Test for bug#21824.
After a modification-hook has been run and there is an overlay in
the *Messages* buffer, the message coalescing [2 times] wrongly
runs the modification-hook of the overlay in the 1st buffer, but
with parameters from the *Messages* buffer modification."
(let ((buf nil)
(msg-ov nil))
(with-temp-buffer
(insert "123")
(overlay-put (make-overlay 1 3)
'modification-hooks
(list (lambda (&rest _)
(setq buf (current-buffer)))))
(goto-char 2)
(insert "x")
(unwind-protect
(progn
(setq msg-ov (make-overlay 1 1 (get-buffer-create "*Messages*")))
(message "a message")
(message "a message")
(should (eq buf (current-buffer))))
(when msg-ov (delete-overlay msg-ov))))))
;;; buffer-tests.el ends here
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