public void Visit_ClassicVisitor_OperationPerformedOnlyOnRegisteredTypes()
{
int externalContext = -1;
var visitor = new GenericVisitor <VisitableBase>();
visitor.AddDelegate <Visitable_1>(s => externalContext = s.Property1);
var subject1 = new Visitable_1 {
Property1 = 5
};
var subject2 = new Visitable_2 {
Property2 = 10
};
subject1.Accept(visitor);
Assert.That(externalContext, Is.EqualTo(subject1.Property1), "must change the external context");
subject2.Accept(visitor);
Assert.That(externalContext, Is.Not.EqualTo(subject2.Property2), "must not change the external context as no delegate was registered");
}
public void Visit_AddSquareFunctionality_SquareCalculatedAndSet()
{
var visitor = new GenericVisitor <VisitableBase>();
Visit_1 square1 = s => s.Property1 *= s.Property1;
Visit_2 square2 = s => s.Property2 *= s.Property2;
visitor
.AddDelegate(square1).AddDelegate(square2);
var s1 = new Visitable_1 {
Property1 = 2
};
var s2 = new Visitable_2 {
Property2 = 3
};
visitor.Visit(s1);
Assert.That(s1.Property1, Is.EqualTo(4));
visitor.Visit(s2);
Assert.That(s2.Property2, Is.EqualTo(9));
}
