'An instance of a class which derives from a class which mixes in
L{FancyEqMixin} should compare unequal to an instance of the base
class if any of their attributes compare unequal.'

def test_inheritedClassesInequality(self):

    self.assertFalse((Record(1, 2) != DerivedRecord(1, 2)))
    self.assertTrue((Record(1, 2) != DerivedRecord(1, 3)))
    self.assertTrue((Record(1, 2) != DerivedRecord(2, 2)))
    self.assertTrue((Record(1, 2) != DerivedRecord(3, 4)))
