def test_minimal(self):
        """
        Tests a minimal satellite that only has a known PRN.

        Tests that the azimuth, elevation and signal to noise ratios
        are L{None} and verifies the repr.
        """
        s = base.Satellite(1)
        self.assertEqual(s.identifier, 1)
        self.assertIsNone(s.azimuth)
        self.assertIsNone(s.elevation)
        self.assertIsNone(s.signalToNoiseRatio)
        self.assertEqual(repr(s), "<Satellite (1), azimuth: None, "
                                   "elevation: None, snr: None>")

        Tests a minimal satellite that only has a known PRN.

        Tests that the azimuth, elevation and signal to noise ratios
        are L{None} and verifies the repr.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py