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About the name: abstract_tests could be used e.g.:
 @abstract_tests
 class AbcSetTests(TestCase):
 # test abc.Set
 Set = abstract_property()
 def setUp(self):
 self.set = self.Set('abc')
 def test_difference(self):
 self.assert... 
 
 def test_union(self):
 self.assert...
It is clear that AbcSetTests do not run because the class is abstract
(can't create an instance). It is clear that to create a concrete test,
you need to subclass the abstract class (serve as a base class):
 class BuiltinSetTests(AbcSetTests):
 # test builtins.set
 Set = set
 class FrozenSetTests(AbcSetTests):
 # test frozenset
 Set = frozenset
It might not be necessary to enforce all abstract constraints in the
implementation initially. The only thing that needs to be implemented is
that tests from @abstract_tests decorated class should not be run.