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;;; fill-tests.el --- ERT tests for fill.el -*- lexical-binding: t -*-
;; Copyright (C) 2017-2026 Free Software Foundation, Inc.
;; Author: Marcin Borkowski <mbork@mbork.pl>
;; Keywords: text
;; 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:
;; This package defines tests for the filling feature, specifically
;; the `fill-polish-nobreak-p' function.
;;; Code:
(require 'ert)
(require 'ert-x)
(ert-deftest fill-test-no-fill-polish-nobreak-p nil
"Tests of the `fill-polish-nobreak-p' function."
(with-temp-buffer
(insert "Abc d efg (h ijk).")
(setq fill-column 8)
(setq-local fill-nobreak-predicate '())
(fill-paragraph)
(should (string= (buffer-string) "Abc d\nefg (h\nijk).")))
(with-temp-buffer
(insert "Abc d efg (h ijk).")
(setq fill-column 8)
(setq-local fill-nobreak-predicate '(fill-polish-nobreak-p))
(fill-paragraph)
(should (string= (buffer-string) "Abc\nd efg\n(h ijk)."))))
(ert-deftest fill-test-unbreakable-paragraph ()
;; See bug#45720 and bug#53537.
:expected-result :failed
(with-temp-buffer
(let ((string "aaa = baaaaaaaaaaaaaaaaaaaaaaaaaaaa\n"))
(insert string)
(goto-char (point-min))
(search-forward "b")
(let* ((pos (point))
(beg (pos-bol))
(end (pos-eol))
(fill-prefix (make-string (- pos beg) ?\s))
;; `fill-column' is too small to accommodate the current line
(fill-column (- end beg 10)))
(fill-region-as-paragraph beg end nil nil pos))
(should (equal (buffer-string) string)))))
(ert-deftest fill-test-breakable-paragraph ()
(with-temp-buffer
(let ((string "aaa = baaaaaaaa aaaaaaaaaa aaaaaaaaaa\n"))
(insert string)
(goto-char (point-min))
(search-forward "b")
(let* ((pos (point))
(beg (pos-bol))
(end (pos-eol))
(fill-prefix (make-string (- pos beg) ?\s))
;; `fill-column' is too small to accommodate the current line
(fill-column (- end beg 10)))
(fill-region-as-paragraph beg end nil nil pos))
(should (equal
(buffer-string)
"aaa = baaaaaaaa aaaaaaaaaa\n aaaaaaaaaa\n")))))
(ert-deftest fill-test-end-period ()
(should
(equal
(with-temp-buffer
(text-mode)
(auto-fill-mode)
(insert "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eius.")
(self-insert-command 1 ?\s)
(buffer-string))
"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eius. "))
(should
(equal
(with-temp-buffer
(text-mode)
(auto-fill-mode)
(insert "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eius.Foo")
(forward-char -3)
(self-insert-command 1 ?\s)
(buffer-string))
"Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
eius. Foo")))
(ert-deftest fill-test-haskell ()
(should
(equal
(with-temp-buffer
(asm-mode)
(dolist (line '(" ;; a b c"
" ;; d e f"
" ;; x y z"
" ;; w"))
(insert line "\n"))
(goto-char (point-min))
(end-of-line)
(setf fill-column 10)
(fill-paragraph nil)
(buffer-string))
" ;; a b c
;; d e f
;; x y z
;; w
")))
(ert-deftest fill-test-fill-region-as-paragraph-default ()
"Test the `fill-region-as-paragraph-default' function."
(ert-test-erts-file (ert-resource-file "fill-region-as-paragraph-default.erts")))
(ert-deftest fill-test-fill-region-as-paragraph-semlf ()
"Test the `fill-region-as-paragraph-semlf' function."
(ert-test-erts-file (ert-resource-file "fill-region-as-paragraph-semlf.erts")))
(ert-deftest fill-test-fill-region-as-paragraph ()
"Test the `fill-region-as-paragraph' function."
(ert-test-erts-file (ert-resource-file "fill-region-as-paragraph.erts")))
(ert-deftest fill-test-fill-region ()
"Test the `fill-region' function."
(ert-test-erts-file (ert-resource-file "fill-region.erts")))
(ert-deftest fill-test-fill-paragraph ()
"Test the `fill-paragraph' function."
(ert-test-erts-file (ert-resource-file "fill-paragraph.erts")))
(ert-deftest fill-test-fill-paragraph-semlf ()
"Test the `fill-paragraph-semlf' function."
(ert-test-erts-file (ert-resource-file "fill-paragraph-semlf.erts")))
(ert-deftest fill-test-fill-paragraph-semlf-emacs-lisp-mode ()
"Test the `fill-paragraph-semlf' function in `emacs-lisp-mode'."
(ert-test-erts-file (ert-resource-file "fill-paragraph-semlf-emacs-lisp-mode.erts")))
(ert-deftest fill-test-fill-paragraph-semlf-c-mode ()
"Test the `fill-paragraph-semlf' function in `c-mode'."
(ert-test-erts-file (ert-resource-file "fill-paragraph-semlf-c-mode.erts")))
(ert-deftest fill-test-fill-paragraph-semlf-org-mode ()
"Test the `fill-paragraph-semlf' function in `org-mode'."
(ert-test-erts-file (ert-resource-file "fill-paragraph-semlf-org-mode.erts")))
(ert-deftest fill-test-fill-paragraph-semlf-markdown-mode ()
"Test the `fill-paragraph-semlf' function in `markdown-mode'."
(skip-unless (functionp 'markdown-mode))
(ert-test-erts-file (ert-resource-file "fill-paragraph-semlf-markdown-mode.erts")))
(provide 'fill-tests)
;;; fill-tests.el ends here
|
