public void model_duck_cannot_fly_then_add_rocket()
{
Duck model = new ModelDuck();
Assert.AreEqual("I can't fly.", model.PerformFly());
model.SetFlyBehaviour(new FlyRocketPowered());
Assert.AreEqual("I'm flying with a rocket!", model.PerformFly());
}
public void model_duck_cannot_fly()
{
Duck model = new ModelDuck();
Assert.AreEqual("I can't fly.", model.PerformFly());
}