test_implementation_checks.py 文件源码

def test_concrete_abc_detection(self):
        @six.add_metaclass(abc.ABCMeta)
        class B(object):
            def __init__(self):
                self.foo = 'bar'

        class Concrete(B, pure_interface.PureInterface):
            pass

        self.assertFalse(Concrete._pi.type_is_pure_interface)
        try:
            c = Concrete()
        except Exception as exc:
            self.fail('Instantiation failed {}'.format(exc))