'Tests that a simple heading has a value in decimal degrees, which is
also its value when converted to a float. Its variation, and by
consequence its corrected heading, is L{None}.'

def test_simple(self):

    h = base.Heading(1.0)
    self.assertEqual(h.inDecimalDegrees, 1.0)
    self.assertEqual(float(h), 1.0)
    self.assertIsNone(h.variation)
    self.assertIsNone(h.correctedHeading)
