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;;; scroll-lock-tests.el --- Test suite for scroll-lock -*- 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)
(require 'scroll-lock)
(defun point-in-window-line-p (n)
"Return if point is in window line N.
Meaning of N as in `move-to-window-line'.
Precondition: the line N must be available in the window."
(save-excursion
(let ((point (progn (beginning-of-line) (point))))
(let ((moved-to-line (move-to-window-line n)))
(cl-assert (= n moved-to-line) t "precondition violation"))
(= point (progn (beginning-of-line) (point))))))
(ert-deftest scroll-lock-next-line-always-scroll-1 ()
"Point stays in top line."
(with-temp-buffer
(insert "\n\n\n")
(goto-char (point-min))
(switch-to-buffer (current-buffer))
(scroll-lock-next-line-always-scroll)
(should (point-in-window-line-p 0))))
(ert-deftest scroll-lock-next-line-always-scroll-2 ()
"Point stays in second line."
(with-temp-buffer
(scroll-lock-mode)
(insert "\n\n\n")
(goto-char (1+ (point-min)))
(switch-to-buffer (current-buffer))
(scroll-lock-next-line-always-scroll)
(should (point-in-window-line-p 1))))
(ert-deftest scroll-lock-next-line-always-scroll-3 ()
"Point stays in second line when scrolling beyond the number of buffer lines."
(with-temp-buffer
(scroll-lock-mode)
(insert (make-string 1000 ?\n))
(goto-char (1+ (point-min)))
(switch-to-buffer (current-buffer))
(scroll-lock-next-line-always-scroll 1234)
(should (point-in-window-line-p 1))))
(provide 'scroll-lock-tests)
;;; scroll-lock-tests.el ends here
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