Add a basic framework for a test suite

The test suite uses the standard automake support. Tests are always built,
but run only when you do a "make check".

tests/simple.cpp

@@ -0,0 +1,32 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <zmq.h>
+
+/*  This is the simplest possible test case; test if we can initialize and
+    immediately terminate a context. */
+int main (int argc, char *argv [])
+{
+    void *ctx;
+
+    ctx = zmq_init (1);
+    zmq_term (ctx);
+
+    return 0;
+}