2019-07-04 22:32:44 +02:00
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;;; scroll-lock-tests.el --- Test suite for scroll-lock -*- lexical-binding: t -*-
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2022-01-01 02:45:51 -05:00
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;; Copyright (C) 2019-2022 Free Software Foundation, Inc.
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2019-07-04 22:32:44 +02:00
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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 'scroll-lock)
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(defun point-in-window-line-p (n)
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"Return if point is in window line N.
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Meaning of N as in `move-to-window-line'.
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Precondition: the line N must be available in the window."
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(save-excursion
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(let ((point (progn (beginning-of-line) (point))))
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(let ((moved-to-line (move-to-window-line n)))
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(cl-assert (= n moved-to-line) t "precondition violation"))
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(= point (progn (beginning-of-line) (point))))))
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(ert-deftest scroll-lock-next-line-always-scroll-1 ()
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"Point stays in top line."
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(with-temp-buffer
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(insert "\n\n\n")
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(goto-char (point-min))
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(switch-to-buffer (current-buffer))
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(scroll-lock-next-line-always-scroll)
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(should (point-in-window-line-p 0))))
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(ert-deftest scroll-lock-next-line-always-scroll-2 ()
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"Point stays in second line."
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(with-temp-buffer
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(scroll-lock-mode)
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(insert "\n\n\n")
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(goto-char (1+ (point-min)))
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(switch-to-buffer (current-buffer))
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(scroll-lock-next-line-always-scroll)
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(should (point-in-window-line-p 1))))
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(ert-deftest scroll-lock-next-line-always-scroll-3 ()
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"Point stays in second line when scrolling beyond the number of buffer lines."
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(with-temp-buffer
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(scroll-lock-mode)
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(insert (make-string 1000 ?\n))
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(goto-char (1+ (point-min)))
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(switch-to-buffer (current-buffer))
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(scroll-lock-next-line-always-scroll 1234)
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(should (point-in-window-line-p 1))))
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(provide 'scroll-lock-tests)
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;;; scroll-lock-tests.el ends here
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