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* lisp/image.el (image--set-property): Ensure new value is set even in the unlikely case that the plist is empty. Fix off-by-one-link error when deleting a property. (bug#35285) * test/lisp/image-tests.el: New file. (image--set-property): New test.
46 lines
1.7 KiB
EmacsLisp
46 lines
1.7 KiB
EmacsLisp
;;; image-tests.el --- tests for image.el -*- lexical-binding: t -*-
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;; Copyright (C) 2019 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Code:
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(require 'ert)
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(require 'image)
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(ert-deftest image--set-property ()
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"Test `image--set-property' behavior."
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(let ((image (list 'image)))
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;; Add properties.
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(setf (image-property image :scale) 1)
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(should (equal image '(image :scale 1)))
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(setf (image-property image :width) 8)
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(should (equal image '(image :scale 1 :width 8)))
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(setf (image-property image :height) 16)
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(should (equal image '(image :scale 1 :width 8 :height 16)))
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;; Delete properties.
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(setf (image-property image :type) nil)
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(should (equal image '(image :scale 1 :width 8 :height 16)))
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(setf (image-property image :scale) nil)
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(should (equal image '(image :width 8 :height 16)))
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(setf (image-property image :height) nil)
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(should (equal image '(image :width 8)))
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(setf (image-property image :width) nil)
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(should (equal image '(image)))))
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;;; image-tests.el ends here
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