public void NullReferenceException_When_Invoking()
{
Duck source = null;
IDuck target = source.As <IDuck>();
Assert.NotNull(target);
Assert.Throws <NullReferenceException>(() => target.Quack());
}
public void Null_Can_Be_Goosed()
{
Duck source = null;
IDuck target = source.As <IDuck>();
Assert.NotNull(target);
Assert.Null(target.GetSource <Duck>());
}
public void Should_Use_Original_Object()
{
Duck source = new Duck();
IDuck target = source.As <IDuck>();
Assert.Same(source, target);
Assert.Same(source, target.GetSource <Duck>());
Assert.Throws <ArgumentException>(() => target.GetSource <ExecitedDuck>());
}