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;;; visual-wrap-tests.el --- Tests for `visual-wrap-prefix-mode' -*- lexical-binding: t; -*-
;; Copyright (C) 2024-2026 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/>.
;;; Commentary:
;; Tests for `visual-wrap-prefix-mode'.
;;; Code:
(require 'visual-wrap)
(require 'ert)
;;; Tests:
(ert-deftest visual-wrap-tests/simple ()
"Test adding wrapping properties to text without display properties."
(with-temp-buffer
(insert "greetings\n* hello\n* hi")
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("greetings\n* hello\n* hi"
10 12 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
12 17 ( wrap-prefix (space :align-to (2 . width)))
18 20 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
20 22 ( wrap-prefix (space :align-to (2 . width))))))))
(ert-deftest visual-wrap-tests/safe-display ()
"Test adding wrapping properties to text with safe display properties."
(with-temp-buffer
(insert #("* hello" 2 7 (display (raise 1))))
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("* hello"
0 2 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
2 7 ( wrap-prefix (space :align-to (2 . width))
display (raise 1)))))))
(ert-deftest visual-wrap-tests/unsafe-display/within-line ()
"Test adding wrapping properties to text with unsafe display properties.
When these properties don't extend across multiple lines,
`visual-wrap-prefix-mode' can still add wrapping properties."
(with-temp-buffer
(insert #("* [img]" 2 7 (display (image :type bmp))))
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("* [img]"
0 2 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
2 7 ( wrap-prefix (space :align-to (2 . width))
display (image :type bmp)))))))
(ert-deftest visual-wrap-tests/unsafe-display/spanning-lines ()
"Test adding wrapping properties to text with unsafe display properties.
When these properties do extend across multiple lines,
`visual-wrap-prefix-mode' must avoid adding wrapping properties."
(with-temp-buffer
(insert #("* a\n* b" 0 7 (display (image :type bmp))))
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("* a\n* b" 0 7 (display (image :type bmp)))))))
(ert-deftest visual-wrap-tests/unsafe-display/multiple-1 ()
"Test adding wrapping properties to text with unsafe display properties.
This tests a multi-line unsafe display prop immediately followed by a
single-line unsafe display prop. `visual-wrap-prefix-mode' should *not*
add wrapping properties to either block."
(with-temp-buffer
(insert #("* a\n* b"
0 4 (display ((image :type bmp)))
4 7 (display ((image :type bmp) (height 1.5)))))
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
;; NOTE: See the note in `visual-wrap-prefix-function'. If
;; applying the change mentioned there, then this case
;; should add wrapping properties to the second block.
#("* a\n* b"
0 4 (display ((image :type bmp)))
4 7 (display ((image :type bmp) (height 1.5))))))))
(ert-deftest visual-wrap-tests/unsafe-display/multiple-2 ()
"Test adding wrapping properties to text with unsafe display properties.
This tests a multi-line unsafe display prop immediately followed by
another multi-line unsafe display prop. `visual-wrap-prefix-mode'
should *not* add wrapping properties to either block."
(with-temp-buffer
(insert #("* a\n* b\n"
0 4 (display ((image :type bmp)))
4 8 (display ((image :type bmp) (height 1.5)))))
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("* a\n* b\n"
0 4 (display ((image :type bmp)))
4 8 (display ((image :type bmp) (height 1.5))))))))
(ert-deftest visual-wrap-tests/wrap-prefix-stickiness ()
"Test that `wrap-prefix' doesn't persist across multiple lines when typing.
See bug#76018."
(with-temp-buffer
(insert "* this zoo contains goats")
(visual-wrap-prefix-function (point-min) (point-max))
(should (equal-including-properties
(buffer-string)
#("* this zoo contains goats"
0 2 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
2 25 ( wrap-prefix (space :align-to (2 . width))))))
(let ((start (point)))
(insert-and-inherit "\n\nit also contains pandas")
(visual-wrap-prefix-function start (point-max)))
(should (equal-including-properties
(buffer-string)
#("* this zoo contains goats\n\nit also contains pandas"
0 2 ( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))
2 25 ( wrap-prefix (space :align-to (2 . width))))))))
(ert-deftest visual-wrap-tests/cleanup ()
"Test that deactivating `visual-wrap-prefix-mode' cleans up text properties."
(with-temp-buffer
(insert "* hello\n* hi")
(visual-wrap-prefix-function (point-min) (point-max))
;; Make sure we've added the visual-wrapping properties.
(should (equal (text-properties-at (point-min))
'( wrap-prefix (space :align-to (2 . width))
display (min-width ((2 . width))))))
(visual-wrap-prefix-mode -1)
(should (equal-including-properties
(buffer-string)
"* hello\n* hi"))))
;; visual-wrap-tests.el ends here
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