test/automated/bindings.el

   1 ;;; bindings.el --- tests for variable bindings
   2
   3 ;; Copyright (C) 2012  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 (defvar binding-test-buffer-A (get-buffer-create "A"))
  23 (defvar binding-test-buffer-B (get-buffer-create "B"))
  24
  25 (defvar binding-test-always-local 'always)
  26 (make-variable-buffer-local 'binding-test-always-local)
  27
  28 (defvar binding-test-some-local 'some)
  29 (with-current-buffer binding-test-buffer-A
  30   (set (make-local-variable 'binding-test-some-local) 'local))
  31
  32 (ert-deftest binding-test-manual ()
  33   "A test case from the elisp manual."
  34   (save-excursion
  35     (set-buffer binding-test-buffer-A)
  36     (let ((binding-test-some-local 'something-else))
  37       (should (eq binding-test-some-local 'something-else))
  38       (set-buffer binding-test-buffer-B)
  39       (should (eq binding-test-some-local 'some)))
  40     (should (eq binding-test-some-local 'some))
  41     (set-buffer binding-test-buffer-A)
  42     (should (eq binding-test-some-local 'local))))
  43
  44 (ert-deftest binding-test-setq-default ()
  45   "Test that a setq-default has no effect when there is a local binding."
  46   (save-excursion
  47     (set-buffer binding-test-buffer-B)
  48     ;; This variable is not local in this buffer.
  49     (let ((binding-test-some-local 'something-else))
  50       (setq-default binding-test-some-local 'new-default))
  51     (should (eq binding-test-some-local 'some))))
  52
  53 (ert-deftest binding-test-makunbound ()
  54   "Tests of makunbound, from the manual."
  55   (save-excursion
  56     (set-buffer binding-test-buffer-B)
  57     (should (boundp 'binding-test-some-local))
  58     (let ((binding-test-some-local 'outer))
  59       (let ((binding-test-some-local 'inner))
  60         (makunbound 'binding-test-some-local)
  61         (should (not (boundp 'binding-test-some-local))))
  62       (should (and (boundp 'binding-test-some-local)
  63                    (eq binding-test-some-local 'outer))))))
  64
  65 (ert-deftest binding-test-defvar-bool ()
  66   "Test DEFVAR_BOOL"
  67   (let ((display-hourglass 5))
  68     (should (eq display-hourglass t))))
  69
  70 (ert-deftest binding-test-defvar-int ()
  71   "Test DEFVAR_INT"
  72   (should-error (setq gc-cons-threshold 5.0) :type 'wrong-type-argument))
  73
  74 (ert-deftest binding-test-set-constant-t ()
  75   "Test setting the constant t"
  76   (should-error (setq t 'bob) :type 'setting-constant))
  77
  78 (ert-deftest binding-test-set-constant-nil ()
  79   "Test setting the constant nil"
  80   (should-error (setq nil 'bob) :type 'setting-constant))
  81
  82 (ert-deftest binding-test-set-constant-keyword ()
  83   "Test setting a keyword constant"
  84   (should-error (setq :keyword 'bob) :type 'setting-constant))
  85
  86 (ert-deftest binding-test-set-constant-nil ()
  87   "Test setting a keyword to itself"
  88   (should (setq :keyword :keyword)))
  89
  90 ;; More tests to write -
  91 ;; kill-local-variable
  92 ;; defconst; can modify
  93 ;; defvar and defconst modify the local binding [ doesn't matter for us ]
  94 ;; various kinds of special internal forwarding objects
  95 ;;   a couple examples in manual, not enough
  96 ;; frame-local vars
  97 ;; variable aliases
  98
  99 ;;; bindings.el ends here