'Altitudes can be instantiated and reports the correct value in
meters and feet, as well as when converted to float.'

def test_value(self):

    altitude = base.Altitude(1.0)
    self.assertEqual(float(altitude), 1.0)
    self.assertEqual(altitude.inMeters, 1.0)
    self.assertEqual(altitude.inFeet, (1.0 / base.METERS_PER_FOOT))
