New file test/src/marker-tests.el

1 files changed, 60 insertions, 0 deletions

diff --git a/test/src/marker-tests.el b/test/src/marker-tests.el
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+;;; marker-tests.el --- tests for marker.c functions -*- lexical-binding: t -*-
+
+;; Copyright (C) 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)
+
+;; The following three tests assert that Emacs survives operations
+;; copying a marker whose character position differs from its byte
+;; position into a buffer whose character size equals its byte size
+;; (Bug#24368).
+
+(ert-deftest marker-set-window-start-from-other-buffer ()
+  "`set-window-start' from other buffer's marker."
+  (let ((text-quoting-style 'curve))
+    (describe-function 'describe-function))
+  (let* ((help (get-buffer "*Help*"))
+         (marker (with-current-buffer help
+                   (copy-marker (point-max)))))
+    (should (set-window-start (selected-window) marker))))
+
+(ert-deftest marker-set-window-point-from-other-buffer ()
+  "`set-window-point' from another buffer's marker."
+  (let ((text-quoting-style 'curve))
+    (describe-function 'describe-function))
+  (let* ((help (get-buffer "*Help*"))
+         (marker (with-current-buffer help
+                   (copy-marker (point-max)))))
+    (with-selected-window (get-buffer-window help)
+      (should (set-window-point (get-buffer-window "*scratch*") marker)))))
+
+(ert-deftest marker-goto-char-from-other-buffer ()
+  "`goto-char' from another buffer's marker."
+  (let ((text-quoting-style 'curve))
+    (describe-function 'describe-function))
+  (let ((marker-1 (make-marker))
+        (marker-2 (make-marker)))
+    (describe-function 'describe-function)
+    (with-current-buffer "*Help*"
+      (set-marker marker-1 (point-max)))
+    (set-marker marker-2 marker-1)
+    (should (goto-char marker-2))))
+
+;;; marker-tests.el ends here.