@Test
     public void testPizzaBuilders() {
         Waiter waiter = new Waiter();
        PizzaBuilder hawaiian_pizzabuilder = new HawaiianPizzaBuilder();
        PizzaBuilder spicy_pizzabuilder = new SpicyPizzaBuilder();

        waiter.setPizzaBuilder( hawaiian_pizzabuilder );
        waiter.constructPizza();

        Pizza pizza = waiter.getPizza();
        Assert.assertEquals(pizza, hawaiian_pizzabuilder.getPizza());
        
    }