test/lisp/jit-lock-tests.el

   1 ;;; jit-lock-tests.el --- tests for jit-lock
   2
   3 ;; Copyright (C) 2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Dmitry Gutov <dgutov@yandex.ru>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 (require 'jit-lock)
  27 (require 'ert-x)
  28
  29 (defun jit-lock-tests--setup-buffer ()
  30   (setq font-lock-defaults '(nil t))
  31   (let (noninteractive)
  32     (font-lock-mode)))
  33
  34 (ert-deftest jit-lock-fontify-now-fontifies-a-new-buffer ()
  35   (ert-with-test-buffer (:name "xxx")
  36     (jit-lock-tests--setup-buffer)
  37     (insert "xyz")
  38     (jit-lock-fontify-now (point-min) (point-max))
  39     (should-not (text-property-not-all (point-min) (point-max) 'fontified t))))
  40
  41 (ert-deftest jit-lock-fontify-now-mends-the-gaps ()
  42   (ert-with-test-buffer (:name "xxx")
  43     (jit-lock-tests--setup-buffer)
  44     (insert "aaabbbcccddd")
  45     (with-silent-modifications
  46       (put-text-property 1 4 'fontified t)
  47       (put-text-property 7 10 'fontified t))
  48     (jit-lock-fontify-now (point-min) (point-max))
  49     (should-not (text-property-not-all (point-min) (point-max) 'fontified t))))
  50
  51 (ert-deftest jit-lock-fontify-now-does-not-refontify-unnecessarily ()
  52   (ert-with-test-buffer (:name "xxx")
  53     (setq font-lock-defaults
  54           (list '(((lambda () (error "Don't call me")))) t))
  55     (let (noninteractive)
  56       (font-lock-mode))
  57     (insert "aaa")
  58     (with-silent-modifications
  59       (put-text-property (point-min) (point-max) 'fontified t))
  60     (jit-lock-fontify-now (point-min) (point-max))))