def test_correctedHeading(self):
        """
        A heading with a value and a variation has a corrected heading.
        """
        h = base.Heading.fromFloats(1., variationValue=-10.)
        self.assertEqual(h.correctedHeading, base.Angle(11., Angles.HEADING))

        A heading with a value and a variation has a corrected heading.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/positioning/test/test_base.py