def test_invalidWithoutInvariant(self):
        """
        Creating a L{base.PositionError} with values set to an impossible
        combination works if the invariant is not checked.
        """
        error = base.PositionError(pdop=1.0, vdop=1.0, hdop=1.0)
        self.assertEqual(error.pdop, 1.0)
        self.assertEqual(error.hdop, 1.0)
        self.assertEqual(error.vdop, 1.0)

        Creating a L{base.PositionError} with values set to an impossible
        combination works if the invariant is not checked.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py