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;;; button-tests.el --- tests for button.el -*- lexical-binding: t -*-
;; Copyright (C) 2019-2025 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 <https://www.gnu.org/licenses/>.
;;; Code:
(require 'ert)
(defvar-keymap button-tests--map
:doc "Keymap for testing command substitution."
"x" #'ignore)
(ert-deftest button-at ()
"Test `button-at' behavior."
(with-temp-buffer
(should-not (button-at (point)))
(let ((button (insert-text-button "text button"))
(marker (button-at (1- (point)))))
(should (markerp marker))
(should (= (button-end button) (button-end marker) (point))))
(let ((button (insert-button "overlay button"))
(overlay (button-at (1- (point)))))
(should (overlayp overlay))
(should (eq button overlay)))
;; Buttons and widgets are incompatible (bug#34506).
(widget-create 'link "link widget")
(should-not (button-at (1- (point))))))
(ert-deftest button--help-echo-string ()
"Test `button--help-echo' with strings."
(with-temp-buffer
;; Text property buttons.
(let ((button (insert-text-button
"text" 'help-echo "text: \\<button-tests--map>\\[ignore]")))
(should (equal (button--help-echo button) "text: x")))
;; Overlay buttons.
(let ((button (insert-button "overlay" 'help-echo
"overlay: \\<button-tests--map>\\[ignore]")))
(should (equal (button--help-echo button) "overlay: x")))))
(ert-deftest button--help-echo-form ()
"Test `button--help-echo' with forms."
(with-temp-buffer
;; Test text property buttons with dynamic scoping.
(setq lexical-binding nil)
(let* ((help (make-symbol "help"))
(form `(funcall (let ((,help "lexical form"))
(lambda () ,help))))
(button (insert-text-button "text" 'help-echo form)))
(set help "dynamic: \\<button-tests--map>\\[ignore]")
(should (equal (button--help-echo button) "dynamic: x")))
;; Test overlay buttons with lexical scoping.
(setq lexical-binding t)
(let* ((help (make-symbol "help"))
(form `(funcall
(let ((,help "lexical: \\<button-tests--map>\\[ignore]"))
(lambda () ,help))))
(button (insert-button "overlay" 'help-echo form)))
(set help "dynamic form")
(should (equal (button--help-echo button) "lexical: x")))))
(ert-deftest button--help-echo-function ()
"Test `button--help-echo' with functions."
(with-temp-buffer
;; Text property buttons.
(let* ((owin (selected-window))
(obuf (current-buffer))
(opos (point))
(help (lambda (win obj pos)
(should (eq win owin))
(should (eq obj obuf))
(should (= pos opos))
"text: \\<button-tests--map>\\[ignore]"))
(button (insert-text-button "text" 'help-echo help)))
(should (equal (button--help-echo button) "text: x"))
;; Overlay buttons.
(setq help (lambda (win obj pos)
(should (eq win owin))
(should (overlayp obj))
(should (eq obj button))
(should (eq (overlay-buffer obj) obuf))
(should (= (overlay-start obj) opos))
(should (= pos opos))
"overlay: \\<button-tests--map>\\[ignore]"))
(setq opos (point))
(setq button (insert-button "overlay" 'help-echo help))
(should (equal (button--help-echo button) "overlay: x")))))
(ert-deftest button--preserve-help-echo ()
"Ensure buttonizing functions preserve existing `help-echo' properties."
;; buttonize.
(let* ((string (propertize "button text" 'help-echo "help text"))
(button (buttonize string #'ignore)))
(should (equal (get-text-property 0 'help-echo button)
"help text")))
;; buttonize-region.
(with-temp-buffer
(insert (propertize "button text" 'help-echo "help text"))
(buttonize-region (point-min) (point) #'ignore)
(should (equal (get-text-property (point-min) 'help-echo)
"help text"))
;; unbuttonize-region should not clear the property either.
(unbuttonize-region (point-min) (point))
(should (equal (get-text-property (point-min) 'help-echo)
"help text")))
;; unbuttonize-region should still clear properties applied with
;; buttonize.
(with-temp-buffer
(insert "button text")
(buttonize-region (point-min) (point) #'ignore nil "help text")
(should (equal (get-text-property (point-min) 'help-echo)
"help text"))
(unbuttonize-region (point-min) (point))
(should (equal (get-text-property (point-min) 'help-echo)
nil))))
;;; button-tests.el ends here
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