Write a superclass encapsulating a rectangle. A rectangle has two attributes representing the width and the height of the rectangle. It has methods returning the perimeter and the area of the rectangle. This class has a subclass, encapsulating a parallelepiped,or box.A parallelepiped has a rectangle as its base, and another attribute, its length; it has two methods that calculate and return its area and vol- ume. You also need to include a JUnit to test these two classes. - Use Statement and Branch coverage techniques.

I have the code mostly done. I am getting an error or two. I am mostly confused with how to set up the J-Unit test stuff. If anyone could help it would be much appreciated!

Thanks

package rectangle;
   public class Rectangle
        {

        protected double width;
        protected double height;

        public Rectangle(double width, double height){
        this.width = width;
        this.height = height;

        }

        public double getWidth(){
        return width;
        }

        public void setWidth(double width) {
        this.width = width;

        }
        public double getHeight(){
        return height;

        }

        public void setHeight(double height){
        this.height = height;

        }

        public double getArea(){
        return width * height;
        }

        public double getPerimeter(){
        return 2 * (width + height);

        }
        }

    public class Box extends Rectangle {
        protected double length;

        public Box(double length){
            super(length, length);
        }

        public double getLength(){
            return length;
        }

        public void setLength(double length){
            this.length = length;
        }

        public double getVolume(){
            return width * height * length;
        }
    }

    public class TestRectangle {

    public static void main(String[] args) {

    Rectangle rectangle = new Rectangle(2,4);
    Box box = new Box(5);

    System.out.println("\nA rectangle " + rectangle.toString());
    System.out.println("The area is " + rectangle.getArea());
    System.out.println("The perimeter is " +rectangle.getPerimeter());
    System.out.println("The volume is " + box.getVolume());
    }
    }