code.delx.au - gnu-emacs/blob - test/automated/thunk-tests.el

   1 ;;; thunk-tests.el --- Tests for thunk.el -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Nicolas Petton <nicolas@petton.fr>
   6 ;; Maintainer: emacs-devel@gnu.org
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; Tests for thunk.el
  26
  27 ;;; Code:
  28
  29 (require 'ert)
  30 (require 'thunk)
  31
  32 (ert-deftest thunk-should-be-lazy ()
  33   (let (x)
  34     (thunk-delay (setq x t))
  35     (should (null x))))
  36
  37 (ert-deftest thunk-can-be-evaluated ()
  38   (let* (x
  39          (thunk (thunk-delay (setq x t))))
  40     (should-not (thunk-evaluated-p thunk))
  41     (should (null x))
  42     (thunk-force thunk)
  43     (should (thunk-evaluated-p thunk))
  44     (should x)))
  45
  46 (ert-deftest thunk-evaluation-is-cached ()
  47   (let* ((x 0)
  48         (thunk (thunk-delay (setq x (1+ x)))))
  49     (thunk-force thunk)
  50     (should (= x 1))
  51     (thunk-force thunk)
  52     (should (= x 1))))
  53
  54 (provide 'thunk-tests)
  55 ;;; thunk-tests.el ends here