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thunk.el is extracted from stream.el in ELPA, with additional tests. * lisp/emacs-lisp/thunk.el: New file. * test/automated/thunk-tests.el: New file. * etc/NEWS: Add information about thunk.el
55 lines
1.5 KiB
EmacsLisp
55 lines
1.5 KiB
EmacsLisp
;;; thunk-tests.el --- Tests for thunk.el -*- lexical-binding: t -*-
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;; Copyright (C) 2015 Free Software Foundation, Inc.
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;; Author: Nicolas Petton <nicolas@petton.fr>
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;; Maintainer: emacs-devel@gnu.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Tests for thunk.el
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;;; Code:
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(require 'ert)
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(require 'thunk)
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(ert-deftest thunk-should-be-lazy ()
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(let (x)
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(thunk-delay (setq x t))
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(should (null x))))
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(ert-deftest thunk-can-be-evaluated ()
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(let* (x
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(thunk (thunk-delay (setq x t))))
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(should-not (thunk-evaluated-p thunk))
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(should (null x))
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(thunk-force thunk)
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(should (thunk-evaluated-p thunk))
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(should x)))
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(ert-deftest thunk-evaluation-is-cached ()
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(let* ((x 0)
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(thunk (thunk-delay (setq x (1+ x)))))
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(thunk-force thunk)
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(should (= x 1))
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(thunk-force thunk)
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(should (= x 1))))
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(provide 'thunk-tests)
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;;; thunk-tests.el ends here
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