public void CardEquality()
{
var card1 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
var card2 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
Assert.Equal(card1, card2);
}
public void Card_DoesntOverrideGetHashCode_HashCodes_ShouldBe_Equal_Fails()
{
var card1 = new CardDefaultHashCode(CardValue.Ace, CardSuit.Diamond);
var card2 = new CardDefaultHashCode(CardValue.Ace, CardSuit.Diamond);
Assert.Equal(card1, card2); //the cards are equal
Assert.Equal(card1.GetHashCode(), card2.GetHashCode()); //but the hash codes are not. Fail.
}
public void HashTable_Key_MustBe_Unique_Fails()
{
var card1 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
var card2 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
var hash = new Hashtable();
hash.Add(card1, "");
Assert.Throws <ArgumentException>(() => hash.Add(card2, ""));
}
public void HashTable_ContainsKey_ShouldBe_True_For_Like_Values_Fails()
{
var card1 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
var card2 = new CardDefaultHashCode(CardValue.Two, CardSuit.Club);
var hash = new Hashtable();
hash.Add(card1, "");
Assert.True(hash.ContainsKey(card1));
Assert.True(hash.ContainsKey(card2));
}
public void Card_DoesntOverrideGetHashCode_Dictionary_ShouldNotContain_DuplicateKeys_Fails()
{
var card1 = new CardDefaultHashCode(CardValue.Ace, CardSuit.Diamond);
var card2 = new CardDefaultHashCode(CardValue.Ace, CardSuit.Diamond);
var dictionary = new Dictionary <object, string>();
dictionary.Add(card1, "");
Assert.True(dictionary.ContainsKey(card1));
Assert.Throws <ArgumentException>(() =>
dictionary.Add(card2, "") //this should throw an exception
);
Assert.Single(dictionary); //there should only be one item in the dictionary, but there are two.
}