public void MustShowHelloWorld()
        {
            // arrange
            ActionHello action = new ActionHello(this.Writer);

            // act
            action.Action();

            // assert
            Assert.AreEqual("Hello World", this.Lines[0]);
        }
        public void MustRaiseException()
        {
            IAction action = new ActionHello(this.Writer);

            action.Action(null);
        }