'Setting the sign of a heading changes the variation sign.'

def test_setVariationSign(self):

    h = base.Heading.fromFloats(1.0, variationValue=1.0)
    h.setSign(1)
    self.assertEqual(h.variation.inDecimalDegrees, 1.0)
    h.setSign((-1))
    self.assertEqual(h.variation.inDecimalDegrees, (-1.0))
