@Test
public void nineFor3x3Square() throws Exception {
Square square = new Square();
square.setSideLength(3);
assertEquals(9, square.area());
}
public static void main(String args[]) {
Circle c = new Circle(30, 40, 2.3);
Rectangle r = new Rectangle(50, 60, 3.5, 4.5);
Square s = new Square(70, 80, 5.5);
System.out.println("Circle c: \n" + c);
System.out.println("\nRectangle r: \n" + r);
System.out.println("\nSquare s: \n" + s);
System.out.println("\n\nArea of Square s = " + s.area());
}