test/automated/let-alist.el

   1 ;;; let-alist.el --- tests for file handling. -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2012-2014 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software: you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation, either version 3 of the License, or
  10 ;; (at your option) any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 ;;; Code:
  21
  22 (require 'ert)
  23 (require 'cl-lib)
  24
  25 (ert-deftest let-alist-surface-test ()
  26   "Tests basic macro expansion for `let-alist'."
  27   (should
  28    (equal '(let ((symbol data))
  29              (let ((.test-one (cdr (assq 'test-one symbol)))
  30                    (.test-two (cdr (assq 'test-two symbol))))
  31                (list .test-one .test-two
  32                      .test-two .test-two)))
  33           (cl-letf (((symbol-function #'gensym) (lambda (x) 'symbol)))
  34             (macroexpand
  35              '(let-alist data (list .test-one .test-two
  36                                     .test-two .test-two)))))))
  37
  38 (defvar let-alist--test-counter 0
  39   "Used to count number of times a function is called.")
  40
  41 (ert-deftest let-alist-evaluate-once ()
  42   "Check that the alist argument is only evaluated once."
  43   (let ((let-alist--test-counter 0))
  44     (should
  45      (equal
  46       (let-alist (list
  47                   (cons 'test-two (cl-incf let-alist--test-counter))
  48                   (cons 'test-three (cl-incf let-alist--test-counter)))
  49         (list .test-one .test-two .test-two .test-three .cl-incf))
  50       '(nil 1 1 2 nil)))))
  51
  52
  53 ;;; let-alist.el ends here