Add interface for and test the bdd_setxor() function added to Buddy.

* wrap/python/buddy.i (bdd_setxor): New function.
* wrap/python/tests/setxor.py: New file.
* wrap/python/tests/Makefile.am (TESTS): Add setxor.py.

wrap/python/tests/Makefile.am

@@ -1,3 +1,5 @@
+## Copyright (C) 2010 Labortatoire de Recherche et Développement de
+## l'EPITA.
 ## Copyright (C) 2003, 2004, 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
 ## département Systèmes Répartis Coopératifs (SRC), Université Pierre
 ## et Marie Curie.
@@ -35,4 +37,5 @@ TESTS = \
   interdep.py \
   minato.py \
   modgray.py \
-  optionmap.py
+  optionmap.py \
+  setxor.py

wrap/python/tests/setxor.py

@@ -0,0 +1,47 @@
+# -*- mode: python; coding: iso-8859-1 -*-
+# Copyright (C) 2010  Laboratoire de Recherche et Développement de l'EPITA.
+#
+# This file is part of Spot, a model checking library.
+#
+# Spot 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 2 of the License, or
+# (at your option) any later version.
+#
+# Spot 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 Spot; see the file COPYING.  If not, write to the Free
+# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+import ltihooks
+import sys
+from buddy import *
+
+bdd_init(10000, 10000)
+bdd_setvarnum(5)
+
+V = [bdd_ithvar(i) for i in range(5)]
+
+a =  V[0] & -V[1] &  V[2] & -V[3]
+b =  V[0] &  V[1] &  V[2] & -V[3]
+c = -V[0] &  V[1] & -V[2] & -V[3]
+
+assert(c == bdd_setxor(a,b))
+assert(c == bdd_setxor(b,a))
+assert(a == bdd_setxor(b,c))
+assert(a == bdd_setxor(c,b))
+assert(b == bdd_setxor(a,c))
+assert(b == bdd_setxor(c,a))
+
+d =          V[1] &  V[2] & -V[3] & V[4]
+e =  V[0] &  V[1] & -V[2] & -V[3] & V[4]
+
+assert(e == bdd_setxor(a,d))
+assert(e == bdd_setxor(d,a))
+
+bdd_done()