def test_one_fixture_class_properties(self) -> None:
        '''torment.fixtures.register({}, (), { 'a': fixture_class, })'''

        class A(fixtures.Fixture):
            pass

        fixtures.register(self.ns, ( fixtures.Fixture, ), { 'a': A, })

        _ = self.ns[self.class_name](self.context)

        self.assertIsInstance(_.a, A)
        self.assertEqual(_.a.context, self.context)