public void SubtractNormal()
{
Coordinate coordinate1 = new GeodeticCoordinate(2.0, 2.0);
Coordinate coordinate2 = new GeodeticCoordinate(1.0, 1.0);
Coordinate result = new GeodeticCoordinate(1.0, 1.0);
Coordinate sub = coordinate1.Subtract(coordinate2);
Assert.True(sub == result);
}
public void SubtractNullCoordinate2()
{
Coordinate coordinate1 = new GeodeticCoordinate(2.0, 2.0);
Assert.Throws <ArgumentNullException>(() => coordinate1.Subtract(null));
}