Avoid depreacted zope.testing.doctest by using python's doctest.

CHANGES.txt

@@ -11,6 +11,8 @@ CHANGES
   - ``pos`` provide the positional arguments here
   - ``kws`` provide the keyword arguments here
 
+- Avoid depreacted `zope.testing.doctest` by using python's `doctest`.
+
 
 0.3.1 (2009-12-26)
 ------------------

src/z3c/testing/generation.py

@@ -13,7 +13,7 @@
 from ZODB.DB import DB
 from ZODB.DemoStorage import DemoStorage
 
-from zope.testing import doctest
+import doctest
 from zope.app.publication.zopepublication import ZopePublication
 from zope.app.testing import setup
 from zope.site.folder import rootFolder