How to test my code for proper function?

[Lisa Smith]

I am writing he shoe, deck and card class for blackjack. I am in a slum trying to test the code. i have written a testclass but I am not getting any ouput.I was wondering if you could look at my classes and tell me what I am doing wrong.

  

public class Deck {
    private Card[] deck;   
    private int carddealt;
    
    public Deck() {
       
       deck = new Card[52];
       int cardcount = 0; 
       for ( int suit = 0; suit <= 3; suit++ ) {
          for ( int value = 1; value <= 13; value++ ) {
             deck[cardcount] = new Card(value,suit);
             cardcount++;
          }
       }
       carddealt = 0;
   
     
     }
     
    }

Card

public class Card {
public final static int SPADES = 0,
HEARTS = 1,
DIAMONDS = 2,
CLUBS = 3;

public final static int ACE = 1,
JACK = 11,
QUEEN = 12,
KING = 13;

private final int suit;

private final int value;

public Card(int theValue, int theSuit) {



value = theValue;
suit = theSuit;
}

public int getSuit() {

return suit;
}

public int getValue() {

return value;
}

public String SuittoString() {


switch ( suit ) {
case SPADES: return "Spades";
case HEARTS: return "Hearts";
case DIAMONDS: return "Diamonds";
case CLUBS: return "Clubs";
default: return "Invalid?";
}
}

public String getSValue() {

// If the card's value is invalid, "Invalid?" is returned.
switch ( value ) {
case 1: return "Ace";
case 2: return "2";
case 3: return "3";
case 4: return "4";
case 5: return "5";
case 6: return "6";
case 7: return "7";
case 8: return "8";
case 9: return "9";
case 10: return "10";
case 11: return "Jack";
case 12: return "Queen";
case 13: return "King";
default: return "Invalid?";
}
}

public String toString() {
// Return a String representation of this card, such as
// "10 of Hearts" or "Queen of Spades".
return getSValue() + " of " + SuittoString();
}

} // end class Card

Shoe class

  
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 
 * @author  
 */
public class Shoe {
    /**
     * The list that we store the cards in
     */
    private List cards = new ArrayList();
    private Card[] deck;   // An array of 52 Cards, representing the deck.
    private int cardsUsed; // How many cards have been dealt from the deck.
    
     
    /** 
     * 
     *
     * @param decks The number of decks to put in the shoe
     */
    public Shoe(int decks, int num) {
     
      
 // Places each card in the list
      
    for (int j = 0; j < decks; j++) {
            for (int i = Card.ACE; i < Card.KING; i++) {
                cards.add(new Card(Card.CLUBS, i));
                cards.add(new Card(Card.HEARTS, i));
                cards.add(new Card(Card.DIAMONDS, i));
                cards.add(new Card(Card.SPADES, i));
            }
        }
    }
    
    public Shoe(List cards) {
        this.cards = cards;
    }
    /** 
     * Returns true if there are no more cards in the shoe
     *
     * @return true/false if the shoe is/isn't empty
     */
    public boolean isEmpty() {
        return cards.isEmpty();
    }
    
    
    /** 
     * Removes the card at the end of the shoe from the shoe and returns it.
     * Note: this should only be called on a non-empty shoe
     *
     * @return One card from the shoe
     */
      
    public Card dealCard() {
          // Deals one card from the deck and returns it.
        if (cardsUsed == 52)
           shuffle();
        cardsUsed++;
        return deck[cardsUsed - 1];
    }
 
    
    /**
     * Shuffles this shoe
     */
     public void shuffle() {
          // Put all the used cards back into the deck, and shuffle it into
          // a random order.
        for ( int i = 51; i > 0; i-- ) {
            int rand = (int)(Math.random()*(i+1));
            Card temp = deck[i];
            deck[i] = deck[rand];
            deck[rand] = temp;
        }
        cardsUsed = 0;
    }
    
    
    
   
}
 Test Class

public class CardTest {

//public static void main(String[] args) {

// A card dealt from the deck.

CardTest deck = new CardTest(); // Create the deck.


deck.shuffle();
deck.drawCard();


System.println("Deck contains:");
for ( int i = 0; i <= deck; i++ ) {
// Get a card from the deck, print it out,

card = Card.getValue();

System.println(" " + card);
}


}
}
[CODE]
If you could give me some insight on what i am doing wrong I would be truly grateful.

[Stan James]

Try making some very small tests. Create a card with (1,1) and see if it returns "Ace of Spades" or whatever you expect. Create a deck and see if it has 52 cards, if the 1st, 26th and 52nd cards are what they should be. Shuffle the deck and see if the deck is no longer in perfect order. Draw one card and see if it is no longer in the deck. (Hmmm, that might suggest a new method!) Once you get in this "tiny test" mode, I'm sure you will think of many more. And if the code doesn't lend itself to a test you think of, it may be a sign that you should refactor the code into smaller, simpler, testable methods.
Then do a google search on "test first" or "test driven development" and discover the wonders of writing the test first. A test that fails is your friend, because it tells you what to write. A test for a method that doesn't exist yet certainly qualifies as a test that fails. For a good time, build your new code one test at a time!
JUnit.org is all about a framework to make this kind of testing easy and fun. Test Infected is a great paper on the topic.

[Lisa Smith]

Thanks