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;;; bindings.el --- tests for variable bindings
;; Copyright (C) 2012 Free Software Foundation, Inc.
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(defvar binding-test-buffer-A (get-buffer-create "A"))
(defvar binding-test-buffer-B (get-buffer-create "B"))
(defvar binding-test-always-local 'always)
(make-variable-buffer-local 'binding-test-always-local)
(defvar binding-test-some-local 'some)
(with-current-buffer binding-test-buffer-A
(set (make-local-variable 'binding-test-some-local) 'local))
(ert-deftest binding-test-manual ()
"A test case from the elisp manual."
(save-excursion
(set-buffer binding-test-buffer-A)
(let ((binding-test-some-local 'something-else))
(should (eq binding-test-some-local 'something-else))
(set-buffer binding-test-buffer-B)
(should (eq binding-test-some-local 'some)))
(should (eq binding-test-some-local 'some))
(set-buffer binding-test-buffer-A)
(should (eq binding-test-some-local 'local))))
(ert-deftest binding-test-setq-default ()
"Test that a setq-default has no effect when there is a local binding."
(save-excursion
(set-buffer binding-test-buffer-B)
;; This variable is not local in this buffer.
(let ((binding-test-some-local 'something-else))
(setq-default binding-test-some-local 'new-default))
(should (eq binding-test-some-local 'some))))
(ert-deftest binding-test-makunbound ()
"Tests of makunbound, from the manual."
(save-excursion
(set-buffer binding-test-buffer-B)
(should (boundp 'binding-test-some-local))
(let ((binding-test-some-local 'outer))
(let ((binding-test-some-local 'inner))
(makunbound 'binding-test-some-local)
(should (not (boundp 'binding-test-some-local))))
(should (and (boundp 'binding-test-some-local)
(eq binding-test-some-local 'outer))))))
(ert-deftest binding-test-defvar-bool ()
"Test DEFVAR_BOOL"
(let ((display-hourglass 5))
(should (eq display-hourglass t))))
(ert-deftest binding-test-defvar-int ()
"Test DEFVAR_INT"
(should-error (setq gc-cons-threshold 5.0) :type 'wrong-type-argument))
(ert-deftest binding-test-set-constant-t ()
"Test setting the constant t"
(should-error (setq t 'bob) :type 'setting-constant))
(ert-deftest binding-test-set-constant-nil ()
"Test setting the constant nil"
(should-error (setq nil 'bob) :type 'setting-constant))
(ert-deftest binding-test-set-constant-keyword ()
"Test setting a keyword constant"
(should-error (setq :keyword 'bob) :type 'setting-constant))
(ert-deftest binding-test-set-constant-nil ()
"Test setting a keyword to itself"
(should (setq :keyword :keyword)))
;; More tests to write -
;; kill-local-variable
;; defconst; can modify
;; defvar and defconst modify the local binding [ doesn't matter for us ]
;; various kinds of special internal forwarding objects
;; a couple examples in manual, not enough
;; frame-local vars
;; variable aliases
;;; bindings.el ends here
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