* test/automated/calc-tests.el: New file and add tests for math-bignum.

Fixes: debbugs:17556

test/ChangeLog

+2014-06-28  Leo Liu  <sdl.web@gmail.com>
+
+	* automated/calc-tests.el: New file and add tests for math-bignum.
+	(Bug#17556)
+
 2014-06-27  Michael Albinus  <michael.albinus@gmx.de>
 
 	* automated/dbus-tests.el (dbus--test-register-service)

test/automated/calc-tests.el

+;;; calc-tests.el --- tests for calc                 -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2014  Leo Liu
+
+;; Author: Leo Liu <sdl.web@gmail.com>
+;; Keywords: maint
+
+;; This program 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.
+
+;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'ert)
+(require 'calc)
+
+(ert-deftest test-math-bignum ()
+  ;; bug#17556
+  (let ((n (math-bignum most-negative-fixnum)))
+    (should (math-negp n))
+    (should (cl-notany #'cl-minusp (cdr n)))))
+
+(provide 'calc-tests)
+;;; calc-tests.el ends here
+
+;; Local Variables:
+;; bug-reference-url-format: "http://debbugs.gnu.org/%s"
+;; End: