def test_interface(self):
        """
        Tests that L{base.PositioningBeacon} implements L{IPositioningBeacon}.
        """
        implements = IPositioningBeacon.implementedBy(base.PositioningBeacon)
        self.assertTrue(implements)
        verify.verifyObject(IPositioningBeacon, base.PositioningBeacon(1))

        Tests that L{base.PositioningBeacon} implements L{IPositioningBeacon}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py