public void ID_Intern_derived_class()
{
Interner <int, A> interner = new Interner <int, A>();
var obj1 = new A();
var obj2 = new B();
var obj3 = new B();
var r1 = interner.InternAndUpdateWithMoreDerived(1, obj1);
Assert.AreEqual(obj1, r1, "Objects should be equal");
Assert.AreSame(obj1, r1, "Objects should be same / intern'ed");
var r2 = interner.InternAndUpdateWithMoreDerived(2, obj2);
Assert.AreEqual(obj2, r2, "Objects should be equal");
Assert.AreSame(obj2, r2, "Objects should be same / intern'ed");
// Interning should not replace instances of same class
var r3 = interner.InternAndUpdateWithMoreDerived(2, obj3);
Assert.AreSame(obj2, r3, "Interning should return previous object");
Assert.AreNotSame(obj3, r3, "Interning should not replace previous object of same class");
// Interning should return instances of most derived class
var r4 = interner.InternAndUpdateWithMoreDerived(1, obj2);
Assert.AreSame(obj2, r4, "Interning should return most derived object");
Assert.AreNotSame(obj1, r4, "Interning should replace cached instances of less derived object");
// Interning should not return instances of less derived class
var r5 = interner.InternAndUpdateWithMoreDerived(2, obj1);
Assert.AreNotSame(obj1, r5, "Interning should not return less derived object");
Assert.AreSame(obj2, r5, "Interning should return previously cached instances of more derived object");
}
public void ID_Intern_derived_class()
{
Interner<int, A> interner = new Interner<int, A>();
var obj1 = new A();
var obj2 = new B();
var obj3 = new B();
var r1 = interner.InternAndUpdateWithMoreDerived(1, obj1);
Assert.AreEqual(obj1, r1, "Objects should be equal");
Assert.AreSame(obj1, r1, "Objects should be same / intern'ed");
var r2 = interner.InternAndUpdateWithMoreDerived(2, obj2);
Assert.AreEqual(obj2, r2, "Objects should be equal");
Assert.AreSame(obj2, r2, "Objects should be same / intern'ed");
// Interning should not replace instances of same class
var r3 = interner.InternAndUpdateWithMoreDerived(2, obj3);
Assert.AreSame(obj2, r3, "Interning should return previous object");
Assert.AreNotSame(obj3, r3, "Interning should not replace previous object of same class");
// Interning should return instances of most derived class
var r4 = interner.InternAndUpdateWithMoreDerived(1, obj2);
Assert.AreSame(obj2, r4, "Interning should return most derived object");
Assert.AreNotSame(obj1, r4, "Interning should replace cached instances of less derived object");
// Interning should not return instances of less derived class
var r5 = interner.InternAndUpdateWithMoreDerived(2, obj1);
Assert.AreNotSame(obj1, r5, "Interning should not return less derived object");
Assert.AreSame(obj2, r5, "Interning should return previously cached instances of more derived object");
}