public void Test_demo()
{
{
IImplementation implementationA = new ConcreteImplementationA();
Abstraction abstraction = new Abstraction(implementationA);
abstraction.Operation();
Assert.That(abstraction.GetData() == "ImplementationA");
}
{
IImplementation implementationA = new ConcreteImplementationA();
IImplementation implementationB = new ConcreteImplementationB();
Abstraction abstraction = new Abstraction(implementationB);
abstraction.Operation();
Assert.That(abstraction.GetData() == "ImplementationB");
abstraction = new Abstraction(implementationA);
abstraction.Operation();
Assert.That(abstraction.GetData() == "ImplementationA");
}
}