public void AddCardToDeck_ShouldBe53Cards() { CardName cardName = new CardName(ECardName.Jack); CardSuit cardSuit = new CardSuit(ECardSuit.Diamonds); Card card = new Card(cardName, cardSuit); IDeckOfCards sut = new DeckOfCards(); sut.AddCardToDeck(card); Assert.AreEqual(sut.GetCards().Count, 53); }