unit testing class hierarchies

[Demian Brecht]

Am I missing something? Is there something that wasn't answered by my reply
about using mixins?

from unittest import TestCase

class SharedTestMixin(object):
    def test_shared(self):
        self.assertNotEquals('foo', 'bar')

class TestA(TestCase, SharedTestMixin):
    def test_a(self):
        self.assertEquals('a', 'a')

class TestB(TestCase, SharedTestMixin):
    def test_b(self):
        self.assertEquals('b', 'b')

$ nosetests test.py -v
test_a (test.TestA) ... ok
test_shared (test.TestA) ... ok
test_b (test.TestB) ... ok
test_shared (test.TestB) ... ok

----------------------------------------------------------------------
Ran 4 tests in 0.001s

OK

This seems to be a clear answer to the problem that solves the original
requirements without introducing error-prone, non-obvious solutions.
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