Hunting for the OASIS WSS specifications, I found the WSS: SAML Token Profile Working Draft 15 dated July 19, 2004. Version 15 makes them busy and not finished.
It appears WSE2 does not support SAML because they decided to wait until the spec settled. So now I understand Steve Maine's comment that we are not there yet with SAML.
Now, what about Liberty?
Benjamin Mitchell kindly shares a Unit Test helper tool, NMock. NMock tests side-effects on external objects acted on by the tested class instance. While I don't see this very useful for testing concrete classes, it is useful for interfaces; especially since you can build them dynamically.
A customer focused example would be:
DynamicMock aBill = new DynamicMock(typeof(IBill));
aBill.Expect("Pay");
aCustomer.PayBill(aBill);
aBill.Verify();
Very nice.