def test_setDOPWithoutInvariant(self):
        """
        You can set the PDOP value to value inconsisted with HDOP and VDOP
        when not checking the invariant.
        """
        pe = base.PositionError(hdop=1.0, vdop=1.0)
        pe.pdop = 100.0
        self.assertEqual(pe.pdop, 100.0)

        You can set the PDOP value to value inconsisted with HDOP and VDOP
        when not checking the invariant.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py