public void Test_Covariance()
{
var hy = new Hydrator <PetShop>();
var shop = hy.GetSingle();
Assert.IsNotNull(shop);
//By default, no instantiation for interfaces and abstract types
Assert.IsNull(shop.AnimalEnumerable);
Assert.IsNull(shop.AnimalList);
Assert.IsNull(shop.CatEnumerable);
//Dog list should be initialized as it is type of generic List
Assert.IsNotNull(shop.DogList);
CollectionAssert.IsEmpty(shop.DogList);
//setup generators
hy = hy.With(x => x.AnimalEnumerable, new ListGenerator <Dog>(2)) //Can setup as IEnumerable supports covariance
.With(x => x.CatEnumerable, new ListGenerator <Cat>(2)) //Can setup as no covariance required
.With(x => x.CatList, new ListGenerator <Cat>(3)); //Can setup List type as no covarinace required
//.With(x=>x.AnimalList, new ListGenerator<Cat>(2)) --Cannot setup as IList type doesn't support covariance
//.With(x=>x.DogList, new ListGenerator<Dog>(2)) --Cannot setup as List type doesn't support covariance
shop = hy.GetSingle();
Assert.IsNotNull(shop);
//Ienumerable types must be instantiated
Assert.IsNotNull(shop.AnimalEnumerable);
Assert.AreEqual(2, shop.AnimalEnumerable.Count());
CollectionAssert.AllItemsAreInstancesOfType(shop.AnimalEnumerable, typeof(Dog));
Assert.IsNotNull(shop.CatEnumerable);
Assert.AreEqual(2, shop.CatEnumerable.Count());
CollectionAssert.AllItemsAreInstancesOfType(shop.CatEnumerable, typeof(Cat));
//List type with no covariance should be instantiated
Assert.IsNotNull(shop.CatList);
Assert.AreEqual(3, shop.CatList.Count);
CollectionAssert.AllItemsAreInstancesOfType(shop.CatList, typeof(Cat));
//As we have seen that we cannot setup IList and List types in case of covariance
//We can use the following apporach for such types
shop.AnimalList = new List <Animal>(new Hydrator <Cat>().GetList(2));
shop.DogList = new List <Animal>(new Hydrator <Dog>().GetList(2));
Assert.IsNotNull(shop.DogList);
Assert.AreEqual(2, shop.DogList.Count);
CollectionAssert.AllItemsAreInstancesOfType(shop.DogList, typeof(Dog));
Assert.IsNotNull(shop.AnimalList);
Assert.AreEqual(2, shop.AnimalList.Count);
CollectionAssert.AllItemsAreInstancesOfType(shop.AnimalList, typeof(Cat));
}
public void CanLoadSingleComplexCustomerWithAbstractTypeMapper()
{
var hy = new Hydrator <ComplexCustomer>();
var customer = hy.GetSingle();
Assert.IsNotNull(customer);
//As Animal is an abstract class, it will not be instantiate by default
Assert.IsNull(customer.Pet, "Abstract class cannot be instantiate");
//Set up the generator for abstract type
hy = hy.With(x => x.Pet, new TypeGenerator <Dog>());
customer = hy.GetSingle();
Assert.IsNotNull(customer.Pet);
Assert.IsInstanceOf <Dog>(customer.Pet);
}
