Message 180879 - Python tracker

+1 to where Brett's taking this.  I really like having the PEP399Tests class encapsulating the various boilerplate parts, with some of them as methods, rather than trying to pack them all into one all-powerful decorator.

It would be worth raising an exception in ``pep399_tests.create_test_cases(ExampleTest)`` if ExampleTest inherits from unittest.TestCase.  This is a simple thing that would help people get it right.