[classlib][auth] Compatibility with RI in auth module

[Colin Thorne]

I have been looking at the auth module with a view to increasing the 
test coverage and making sure Harmony is compatible with the RI, and I 
have a couple of questions I was hoping to get answers to.

1) Looking at javax.sercuity.auth.SubjectTest there is a field called 
testing (in SecurityTest) that appears to be used to distinguish the 
behaviour between Harmony and the RI. Is this approach to keep a common 
set of tests for the RI and Harmony to right one for me to be following?

Here is an example from 
javax.security.auth.SubjectTest.testSubject_3Set_InvalidSet()

try {
            new Subject(false, hash, new HashSet(), new HashSet());

            if (!testing) {
                // possible to add 'null' principal via constructor
                fail("No expected NullPointerException");
            }
        } catch (NullPointerException e) {
        }

2) Are these sort of incompatibilities appropriate to remove from the 
Harmony auth implementation? I think Harmony is attempting to be as 
close as possible to the RI implementation and so I assume we should be 
matching behaviour in this case.

Thanks for any insights.

Regards, Colin.