Bugfix, added custom verify module which does

not raise exceptions on decorated methods

src/z3c/testing/app.py

@@ -66,8 +66,8 @@ def makeTestObject(self, object=None, *pos, **kws):
 # Public Base Tests
 #
 ###############################################################################
-from zope.interface.verify import verifyClass
 from zope.interface.verify import verifyObject
+from z3c.testing.verify import verifyClass
 
 
 class InterfaceBaseTest(TestCase):

src/z3c/testing/verify.py

@@ -0,0 +1,84 @@
+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (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.
+#
+##############################################################################
+"""Verify interface implementations
+
+$Id$
+"""
+from zope.interface.exceptions import BrokenImplementation, DoesNotImplement
+from zope.interface.exceptions import BrokenMethodImplementation
+from types import FunctionType, MethodType
+from zope.interface.interface import fromMethod, fromFunction, Method
+from zope.interface.verify import _incompat, MethodTypes
+
+
+def _verify(iface, candidate, tentative=0, vtype=None):
+    """Fix broken testing decorated methods.
+    
+    You can find such a broken interfaces test in z3c.proxy where the
+    methods are decorated within ``@non_overridable``.
+    """
+
+    if vtype == 'c':
+        tester = iface.implementedBy
+    else:
+        tester = iface.providedBy
+
+    if not tentative and not tester(candidate):
+        raise DoesNotImplement(iface)
+
+    # Here the `desc` is either an `Attribute` or `Method` instance
+    for name, desc in iface.namesAndDescriptions(1):
+        if not hasattr(candidate, name):
+            if (not isinstance(desc, Method)) and vtype == 'c':
+                # We can't verify non-methods on classes, since the
+                # class may provide attrs in it's __init__.
+                continue
+
+            raise BrokenImplementation(iface, name)
+
+        attr = getattr(candidate, name)
+        if not isinstance(desc, Method):
+            # If it's not a method, there's nothing else we can test
+            continue
+
+        if isinstance(attr, FunctionType):
+            # should never get here, since classes should not provide functions
+            meth = fromFunction(attr, iface, name=name)
+        elif (isinstance(attr, MethodTypes)
+              and type(attr.im_func) is FunctionType):
+            meth = fromMethod(attr, iface, name)
+        elif isinstance(attr, property):
+            # We can't verify decorated methods on classes.
+            continue
+        else:
+            import pdb; pdb.set_trace()
+            if not callable(attr):
+                raise BrokenMethodImplementation(name, "Not a method")
+            # sigh, it's callable, but we don't know how to intrspect it, so
+            # we have to give it a pass.
+            continue
+
+        # Make sure that the required and implemented method signatures are
+        # the same.
+        desc = desc.getSignatureInfo()
+        meth = meth.getSignatureInfo()
+
+        mess = _incompat(desc, meth)
+        if mess:
+            raise BrokenMethodImplementation(name, mess)
+
+    return True
+
+def verifyClass(iface, candidate, tentative=0):
+    return _verify(iface, candidate, tentative, vtype='c')