Merge 'master' into noverlay

1 files changed, 115 insertions, 0 deletions

diff --git a/test/lisp/textmodes/page-tests.el b/test/lisp/textmodes/page-tests.el
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+;;; page-tests.el --- Tests for page.el  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2019-2022 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-page)
+    (should (equal (page--what-page) '(2 2)))
+    (forward-page)
+    (should (equal (page--what-page) '(3 4)))))
+
+
+;;; page-tests.el ends here