/** BoxAreaTester.java tests the surface area method of Box.java.
 *  in the face of possible roundoff errors.
 *  Compile normally, run with assert enabled:
 *  java -ea BoxAreaTester
 */
public class BoxAreaTester {
    public static void main(String[] args) {
        new BoxAreaTester().testArea();
    }
    
    public void testArea() {
        System.out.print("Testing Box.surfaceArea(): ");
        Box aBox = new Box(2.0, 3.0, 4.0); // test 1
        double area = aBox.surfaceArea();
        assert Math.abs(area - 52.0) < 3.0e-10;
        System.out.print(" 1 ");
        
        aBox = new Box(6.0, 5.0, 4.0); // test 2
        area = aBox.surfaceArea();
        assert Math.abs(area - 148.0) < 3.0e-10;
        System.out.print(" 2 ");
        
        aBox = new Box(6.0*2.54, 5.0*2.54, 4.0*2.54); // test 3, 
        // convert inches to centimetres.
        area = aBox.surfaceArea();
        assert Math.abs(area - 148.0*Math.pow(2.54, 2)) < 3.0e-10;
        System.out.print(" 3 ");
        
        System.out.println(" Passed!");
    }
}