public static void A_EncapsulationAsBindingTogetherDataAndFunctions()
{
var color = "Yellow";
var specialGift = new SpecialFilledAndDecoratedGiftBox(2, color);
// The color is a data of specialGift object.
// It is stored in the field and protected from corruption by the property Color.
// We cannot override data with incorrect value.
specialGift.Color = string.Empty;
specialGift
.Color
.Should()
.Be(color);
// The gift is a data of specialGift object too.
// It is stored in the field and protected from corruption and incorrect filling by the method PackGift.
// We cannot override data or store an incorrect one.
Action packNothing = () => specialGift.PackGift(null);
packNothing.Should().Throw <ArgumentException>();
specialGift
.PackGift("Tale");
Action packAgain = () => specialGift.PackGift("Poem");
packAgain.Should().Throw <InvalidOperationException>();
}
