supporting unsupported tests

[J.T. Conklin]

Hi folks,

We've moved our system to a second platform and some of the tests are
appropriate for one system but not the other.  

What method is typically used to mark a test as not to be run for one
platform?  Should I be thinking about having the test run but always
pass (perhaps by replacing all my use of ExecTest and ShellCommandTest
with subclasses that check a "platform type" property before either
forwarding to the base class or always returning success), or is their
a concept of a "UNTESTABLE" state separate from "PASS" and "FAIL".

    --jtc

-- 
J.T. Conklin