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Refactor to allow testing side effects

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By externalizing the source of i/o and randomness for shuffling, we can
inject non-interactive and deterministic behavior during unit tests.
This commit is contained in:
Dave Burke
2022-02-07 15:02:13 -06:00
parent 15c26cbe09
commit 0b1f57ae4f
5 changed files with 345 additions and 250 deletions
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38
10_Blackjack/java/src/Deck.java
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@@ -1,42 +1,50 @@
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.function.Function;
public class Deck {
private LinkedList<Card> cards;
private Function<LinkedList<Card>, LinkedList<Card>> shuffleAlgorithm;
/**
* Initialize the game deck with the given number of standard decks.
* e.g. if you want to play with 2 decks, then {@code new Decks(2)} will
* initialize 'cards' with 2 copies of a standard 52 card deck.
*
* @param nDecks
* @param shuffleAlgorithm A function that takes the initial sorted card
* list and returns a shuffled list ready to deal.
*
*/
public Deck() {
cards = new LinkedList<>();
for(Card.Suit suit : Card.Suit.values()) {
for(int value = 1; value < 14; value++) {
cards.add(new Card(value, suit));
}
}
public Deck(Function<LinkedList<Card>, LinkedList<Card>> shuffleAlgorithm) {
this.shuffleAlgorithm = shuffleAlgorithm;
}
/**
* Deals one card from the deck, removing it from this object's state.
* Deals one card from the deck, removing it from this object's state. If
* the deck is empty, it will be reshuffled before dealing a new card.
*
* @return The card that was dealt.
*/
public Card deal() {
// TODO implement Deck.deal() - new Card(10, Card.Suit.CLUBS) added temporarily
return new Card(10, Card.Suit.CLUBS);
if(cards == null || cards.isEmpty()) {
reshuffle();
}
return cards.pollFirst();
}
/**
* Shuffle the cards in this deck.
* Shuffle the cards in this deck using the shuffleAlgorithm.
*/
public void shuffle() {
// TODO implement Deck.shuffle()
// Probably just call Collections.shuffle(cards);
public void reshuffle() {
LinkedList<Card> newCards = new LinkedList<>();
for(Card.Suit suit : Card.Suit.values()) {
for(int value = 1; value < 14; value++) {
newCards.add(new Card(value, suit));
}
}
this.cards = this.shuffleAlgorithm.apply(newCards);
}
/**