public void TestPolimorphismDynamic()
{
IDish tapa = new ConcreteDishTapa();
tapa.Name = "Croquetas";
tapa.Price = 8;
IDish dish = new ConcreteDishFull();
dish.Name = "Croquetas";
dish.Price = 8;
double normalDishPrice = dish.GetPrice();
double normalTapaPrice = tapa.GetPrice();
Assert.AreEqual(normalDishPrice, 8f);
Assert.AreEqual(normalTapaPrice, 2f);
//Call the same fucntion with same parameters
//on diff derived classes with diff behaviour
double moneyoffDishPrice = dish.GetPrice(1f);
double moneyoffTapaPrice = tapa.GetPrice(1f);
Assert.AreEqual(moneyoffDishPrice, 7f);
Assert.AreEqual(moneyoffTapaPrice, 2f);
//tapas should not apply moneyoff discounts
Assert.AreEqual(moneyoffTapaPrice, normalTapaPrice);
}
public void TestInheritance()
{
/*** SINGLE INHERITANCE ***/
//Tapa inherits attributes and methods from AbstractDish
ConcreteDishTapa si_tapa = new ConcreteDishTapa();
si_tapa.Name = "Croquetas";
si_tapa.Price = 8;
//Tapa inherits methods from AbstractDish
//percentage discount is implemented ONLY in Abstract dish
//and getprice is overriden in derived classes
Assert.AreEqual(si_tapa.GetPrice(50), 1f);
//An object of the derived class can be casted to it base class
Assert.IsTrue(si_tapa is AbstractDish);
/*** HIERARCHICAL INHERITANCE ***/
//Tapa, halfdish and dish inherits from AbstractDish
ConcreteDishTapa hi_tapa = new ConcreteDishTapa();
ConcreteDishHalf hi_halfdish = new ConcreteDishHalf();
ConcreteDishFull hi_dish = new ConcreteDishFull();
Assert.IsTrue(hi_tapa is AbstractDish);
Assert.IsTrue(hi_halfdish is AbstractDish);
Assert.IsTrue(hi_dish is AbstractDish);
/*** MULTILEVEL INHERITANCE ***/
//Tapa inherits from AbstractDish
//which inherits from AbstractIdentity
ConcreteDishTapa mi_tapa = new ConcreteDishTapa();
mi_tapa.Id = 1;
Assert.IsTrue(mi_tapa is AbstractDish);
AbstractDish mi_dish = mi_tapa;
Assert.IsTrue(mi_dish is AbstractedIdentity);
Assert.IsTrue(mi_tapa is AbstractedIdentity);
/*** MULTIPLE INHERITANCE ***/
//AbstractDish inherits from AbstractIdentity and IDish
ConcreteDishTapa mmi_tapa = new ConcreteDishTapa();
Assert.IsTrue(mmi_tapa is IDish);
Assert.IsTrue(mmi_tapa is AbstractedIdentity);
}
