@Test
 public void testSinSouth() {
   coordinate = new CoordinateImpl(0, 0, 0, compassDirectionS);
   assertTrue(coordinate.Sin() == 0);
 }
 @Test
 public void testCosSouth() {
   coordinate = new CoordinateImpl(0, 0, 0, compassDirectionS);
   assertTrue(coordinate.Cos() == 1);
 }
 @Test
 public void testDirection() {
   assertTrue(coordinateNull.direction() == CompassDirection.NORTH);
 }
 @Test
 public void testRadians() {
   assertTrue(coordinateNull.Radians() == 0);
 }
 @Test
 public void testDegreesW() {
   coordinate = new CoordinateImpl(0, 60, 0, compassDirectionW);
   assertTrue(coordinate.Degrees() == -1.0);
 }