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;;; page-tests.el --- Tests for page.el -*- lexical-binding: t; -*-
;; Copyright (C) 2019-2024 Free Software Foundation, Inc.
;; Author: Simen Heggestøyl <simenheg@gmail.com>
;; Keywords:
;; 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:
;;
;;; Code:
(require 'ert)
(require 'page)
(ert-deftest page-tests-forward-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(forward-page -1)
(should (looking-at-p "\nbaz"))
(forward-page -2)
(should (= (point) (point-min)))
(forward-page 1)
(should (looking-at-p "\nbar"))
(forward-page)
(should (looking-at-p "\nbaz"))
(forward-page 1)
(should (= (point) (point-max)))))
(ert-deftest page-tests-backward-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(backward-page 1)
(should (looking-at-p "\nbaz"))
(backward-page)
(should (looking-at-p "\nbar"))
(backward-page 1)
(should (= (point) (point-min)))
(backward-page -1)
(should (looking-at-p "\nbar"))
(backward-page -2)
(should (= (point) (point-max)))))
(defun page-tests--region-string ()
"Return the contents of the region as a string."
(buffer-substring (region-beginning) (region-end)))
(ert-deftest page-tests-mark-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(mark-page)
(should (equal (page-tests--region-string) "\nbaz"))
(mark-page -2)
(should (equal (page-tests--region-string) "foo\n "))
(mark-page 1)
(should (equal (page-tests--region-string) "\nbar\n "))))
(ert-deftest page-tests-narrow-to-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(goto-char (point-min))
(narrow-to-page)
(should (equal (buffer-string) "foo\n"))
(narrow-to-page 2)
(should (equal (buffer-string) "baz"))
(narrow-to-page -1)
(should (equal (buffer-string) "bar\n"))
(widen)
(goto-char (point-min))
(narrow-to-page)
(should (equal (buffer-string) "foo\n"))
(goto-char (point-max))
(narrow-to-page 2)
(should (equal (buffer-string) "baz"))
(goto-char (point-max))
(narrow-to-page -1)
(should (equal (buffer-string) "bar\n"))))
(ert-deftest page-tests-count-lines-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(goto-char (point-min))
(should (equal (page--count-lines-page) '(1 0 1)))
(goto-char (point-max))
(should (equal (page--count-lines-page) '(2 2 0)))))
(ert-deftest page-tests-what-page ()
(with-temp-buffer
(insert "foo\n \nbar\n \nbaz")
(goto-char (point-min))
(should (equal (page--what-page) '(1 1)))
(forward-char)
(should (equal (page--what-page) '(1 1)))
(forward-page)
(should (equal (page--what-page) '(2 1)))
(forward-line)
(should (equal (page--what-page) '(2 2)))
(forward-page)
(should (equal (page--what-page) '(3 1)))))
;;; page-tests.el ends here
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