Use newer doctest

tests.py

@@ -0,0 +1,46 @@
+##############################################################################
+#
+# Copyright (c) 2003 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Test for missing values.
+
+>>> from Missing import Value
+
+>>> Value != 12
+1
+>>> 12 != Value
+1
+>>> u"abc" != Value
+1
+>>> Value != u"abc"
+1
+
+>>> 1 + Value == Value
+1
+>>> Value + 1 == Value
+1
+>>> Value == 1 + Value
+1
+>>> Value == Value + 1
+1
+
+$Id$
+"""
+import unittest
+from zope.testing.doctest import DocTestSuite
+
+def test_suite():
+    return unittest.TestSuite((
+        DocTestSuite(),
+        ))
+
+if __name__ == '__main__': unittest.main()