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| | ;;; window-tests.el -- tests for window.c -*- lexical-binding: t -*-
;; Copyright (C) 2016 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'ert)
(defun window-test-scrolling (margin &optional effective-margin)
(unless effective-margin
(setq effective-margin margin))
(erase-buffer)
(insert (mapconcat #'number-to-string
(number-sequence 1 200) "\n"))
(goto-char 1)
(sit-for 0)
(let ((scroll-margin margin)
(mode-lines (/ (window-mode-line-height) (line-pixel-height)))
(wstart (window-start)))
;; Stopping before `scroll-margin' so we shouldn't have
;; scrolled.
(let ((current-prefix-arg (- (window-height)
mode-lines (window-start) effective-margin)))
(call-interactively 'next-line))
(sit-for 0)
(should (= wstart (window-start)))
;; Passing `scroll-margin' should trigger scrolling.
(call-interactively 'next-line)
(sit-for 0)
(should (/= wstart (window-start)))
;; Scroll back to top.
(let ((current-prefix-arg (window-start)))
(call-interactively 'scroll-down-command))
(sit-for 0)
(should (= 1 (window-start)))))
(defmacro window-with-test-buffer-window (&rest body)
(let ((bufvar (make-symbol "buf")))
`(let ((,bufvar (get-buffer-create "*test*")))
(with-selected-window (display-buffer ,bufvar)
(with-current-buffer ,bufvar
,@body)))))
(ert-deftest window-test-scroll-margin-0 ()
(skip-unless (not noninteractive))
(window-with-test-buffer-window
(window-test-scrolling 0)))
(ert-deftest window-test-scroll-margin-negative ()
"A negative `scroll-margin' should be the same as 0."
(skip-unless (not noninteractive))
(window-with-test-buffer-window
(window-test-scrolling -10 0)))
(ert-deftest window-test-scroll-margin-max ()
(skip-unless (not noninteractive))
(window-with-test-buffer-window
(let* ((mode-lines (/ (window-mode-line-height) (line-pixel-height)))
(max-margin (/ (- (window-height) mode-lines) 4)))
(window-test-scrolling max-margin))))
(ert-deftest window-test-scroll-margin-over-max ()
"A `scroll-margin' more than max should be the same as max."
(skip-unless (not noninteractive))
(window-with-test-buffer-window
;; Check that mode line is not counted for determining max margin.
(set-window-text-height nil 7)
(let* ((mode-lines (/ (window-mode-line-height) (line-pixel-height)))
(max-margin (/ (- (window-height) mode-lines) 4)))
(window-test-scrolling (+ max-margin 1) max-margin)
(window-test-scrolling (+ max-margin 2) max-margin))))
|