tests and generated Javadoc

src/CardTest.java

@@ -0,0 +1,14 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CardTest {
+
+    @Test
+
+    void constructorWorks() {
+        Card card = new Card(1, Card.Suit.CLUBS);
+        assertEquals(1, card.number);
+        assertEquals(Card.Suit.CLUBS, card.suit);
+    }
+}

src/Game.java

@@ -1,18 +1,18 @@
 public class Game {
     final Players players = new Players();
+    private Pile deck;
 
     /**
      * @param numberOfCards   Total number of cards
      * @param numberOfPlayers Total number of players
      */
     public Game(int numberOfCards, int numberOfPlayers) {
-        Pile deck = Pile.createDeck(numberOfCards);
+        deck = Pile.createDeck(numberOfCards);
         int cardsPerPlayer = deck.size() / numberOfPlayers;
         for (int i = 0; i < numberOfPlayers; i++) {
             Player player = new Player(String.valueOf(i), deck.take(cardsPerPlayer));
             players.add(player);
         }
-        players.play();
     }
 
 

src/GameTest.java

@@ -16,8 +16,8 @@ class GameTest {
     @Test
     void createDeck() {
         assertEquals(2, game.players.size());
-        for (int i = 0; i < 2; i++) {
-            assertEquals(20, game.players.get(i).drawPile.size());
+        for (Player player : game.players) {
+            assertEquals(40 / 2, player.drawPile.size());
         }
     }
 

src/Main.java

@@ -3,8 +3,14 @@
  */
 public class Main {
 
+    /**
+     * The entry point of application.
+     *
+     * @param args the input arguments
+     */
     public static void main(String[] args) {
-        new Game(10, 2);
+        Game game = new Game(10, 2);
+        game.players.play();
         System.out.print(Out.get());
     }
 }

src/Out.java

@@ -1,18 +1,49 @@
 import java.util.ArrayList;
 
+/**
+ * The type Out.
+ */
 public class Out {
+    /**
+     * The Output.
+     */
     static final ArrayList<String> output = new ArrayList<>();
 
-    private Out() { throw new IllegalStateException("Utility class"); }
+    /**
+     * Instantiates a new Out.
+     */
+    protected Out() { throw new IllegalStateException("Utility class"); }
 
+    /**
+     * Gets output.
+     *
+     * @return the output
+     */
+    public static ArrayList<String> getOutput() {
+        return output;
+    }
+
+    /**
+     * Println.
+     *
+     * @param string the string
+     */
     public static void println(String string) {
         output.add(string);
     }
 
+    /**
+     * Println.
+     */
     public static void println() {
         println("");
     }
 
+    /**
+     * Get string.
+     *
+     * @return the string
+     */
     public static String get() {
         StringBuilder string = new StringBuilder();
         for (String s : output) {

src/OutTest.java

@@ -0,0 +1,20 @@
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class OutTest {
+
+    @Test
+    void printlnStoresString() {
+        Out.getOutput().clear();
+        Out.println();
+        assertEquals("\n", Out.get());
+        Out.println("Hello");
+        assertEquals("\nHello\n", Out.get());
+    }
+
+    @Test
+    void throwsException() {
+        assertThrows(IllegalStateException.class, Out::new);
+    }
+}

src/Pile.java

@@ -3,7 +3,16 @@ import java.util.Collections;
 import java.util.Random;
 import java.util.stream.IntStream;
 
+/**
+ * The type Pile.
+ */
 public class Pile extends ArrayList<Card> {
+    /**
+     * Create deck pile.
+     *
+     * @param numberOfCards the number of cards
+     * @return the pile
+     */
     public static Pile createDeck(int numberOfCards) {
         Pile deck = new Pile();
         for (int number = 1; number <= numberOfCards; number++) {
@@ -15,6 +24,12 @@ public class Pile extends ArrayList<Card> {
         return deck;
     }
 
+    /**
+     * Take pile.
+     *
+     * @param number the number
+     * @return the pile
+     */
     public Pile take(int number) {
         Pile taken = new Pile();
         for (int i = 0; i < number; i++) {
@@ -27,6 +42,8 @@ public class Pile extends ArrayList<Card> {
     /**
      * Fisher-Yates shuffle()
      * https://stackoverflow.com/questions/1519736/random-shuffling-of-an-array
+     *
+     * @param random the random
      */
     public void shuffle(Random random) {
         for (int i = this.size() - 1; i > 0; i--) {
@@ -34,15 +51,29 @@ public class Pile extends ArrayList<Card> {
         }
     }
 
+    /**
+     * Shuffle.
+     */
     public void shuffle() {
         Random random = new Random();
         shuffle(random);
     }
 
+    /**
+     * Occurrences long.
+     *
+     * @param max the max
+     * @return the long
+     */
     public long occurrences(int max) {
         return IntStream.range(0, size()).filter(i -> get(i).number == max).count();
     }
 
+    /**
+     * Gets max.
+     *
+     * @return the max
+     */
     public Card getMax() {
         Card max = get(0);
         for (int i = 1; i < this.size(); i++) {

src/PileTest.java

@@ -1,3 +1,4 @@
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import java.util.Random;
@@ -5,17 +6,16 @@ import java.util.Random;
 import static org.junit.jupiter.api.Assertions.*;
 
 class PileTest {
+    Pile pile = new Pile();
 
     @Test
     void shuffleEmptyPile() {
-        Pile pile = new Pile();
         pile.shuffle();
         assertEquals(0, pile.size());
     }
 
     @Test
     void shuffleOneCard() {
-        Pile pile = new Pile();
         pile.add(new Card(1, Card.Suit.CLUBS));
         pile.shuffle();
         assertEquals(1, pile.size());
@@ -24,7 +24,6 @@ class PileTest {
 
     @Test
     void shuffleCards() {
-        Pile pile = new Pile();
         pile.add(new Card(1, Card.Suit.CLUBS));
         pile.add(new Card(2, Card.Suit.DIAMONDS));
         pile.add(new Card(3, Card.Suit.HEARTS));
@@ -41,4 +40,47 @@ class PileTest {
         assertEquals(Card.Suit.HEARTS, pile.get(3).suit);
         assertEquals(4, pile.size());
     }
+
+    @Test
+    void createDeck() {
+        pile = Pile.createDeck(1);
+        assertEquals(1, pile.get(0).number);
+        assertEquals(1, pile.get(1).number);
+        assertEquals(1, pile.get(2).number);
+        assertEquals(1, pile.get(3).number);
+        assertEquals(4, pile.size());
+    }
+
+    @Test
+    void createDeckWith40Cards() {
+        pile = Pile.createDeck(10);
+        assertEquals(40, pile.size());
+    }
+
+    @Test
+    void take() {
+        Pile taken;
+        pile = Pile.createDeck(2);
+        assertEquals(2 * 4, pile.size());
+        taken = pile.take(0);
+        assertEquals(0, taken.size());
+        assertEquals(2 * 4, pile.size());
+        taken = pile.take(3);
+        assertEquals(3, taken.size());
+        assertEquals(2 * 4 - 3, pile.size());
+    }
+
+    @Test
+    void occurrences() {
+        pile = Pile.createDeck(2);
+        assertEquals(4, pile.occurrences(1));
+        assertEquals(4, pile.occurrences(2));
+        assertEquals(0, pile.occurrences(3));
+    }
+
+    @Test
+    void getMax() {
+        pile = Pile.createDeck(2);
+        assertEquals(2, pile.getMax().number);
+    }
 }

src/Player.java

@@ -1,14 +1,37 @@
+/**
+ * The type Player.
+ */
 public class Player {
+    /**
+     * The Name.
+     */
     final String name;
+    /**
+     * The Draw pile.
+     */
     final Pile drawPile;
+    /**
+     * The Discard pile.
+     */
     final Pile discardPile;
 
+    /**
+     * Instantiates a new Player.
+     *
+     * @param name     the name
+     * @param drawPile the draw pile
+     */
     public Player(String name, Pile drawPile) {
         this.name = name;
         this.drawPile = drawPile;
         this.discardPile = new Pile();
     }
 
+    /**
+     * Draw card.
+     *
+     * @return the card
+     */
     public Card draw() {
         if (drawPile.isEmpty()) {
             discardPile.shuffle();
@@ -20,6 +43,11 @@ public class Player {
         return draw;
     }
 
+    /**
+     * Cards count int.
+     *
+     * @return the int
+     */
     public int cardsCount() {
         return drawPile.size() + discardPile.size();
     }

src/PlayerTest.java

@@ -0,0 +1,37 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PlayerTest {
+    Player player;
+    Pile pile;
+
+    @BeforeEach
+    void setUp() {
+        pile = Pile.createDeck(1);
+        player = new Player("0", pile);
+    }
+
+    @Test
+    void drawWithEmptyDrawPile() {
+        int n = player.drawPile.size();
+        player.discardPile.addAll(player.drawPile.take(n));
+        assertEquals(0, player.drawPile.size());
+        assertEquals(n, player.discardPile.size());
+        player.draw();
+        assertEquals(n - 1, player.drawPile.size());
+        assertEquals(0, player.discardPile.size());
+    }
+
+    @Test
+    void draw() {
+        Card card = player.draw();
+        assertEquals(1, card.number);
+    }
+
+    @Test
+    void cardsCount() {
+        assertEquals(4, player.cardsCount());
+    }
+}

src/Players.java

@@ -1,22 +1,34 @@
 import java.util.ArrayList;
 
+/**
+ * The type Players.
+ */
 public class Players extends ArrayList<Player> {
     private final Pile pot = new Pile();
     private final Pile draws = new Pile();
 
+    /**
+     * Play.
+     */
     public void play() {
-        while (playersLeft() != 1) {
-            draws.clear();
-            for (Player player : this) {
-                String output = String.format("Player %s (%d cards)", player.name, player.cardsCount());
-                Card card = player.draw();
-                draws.add(card);
-                Out.println(String.format("%s: %d - %s", output, card.number, card.suit));
+        if (size() > 0) {
+            while (playersLeft() > 1) {
+                draws.clear();
+                for (Player player : this) {
+                    String output = String.format("Player %s (%d cards)", player.name, player.cardsCount());
+                    Card card = player.draw();
+                    draws.add(card);
+                    Out.println(String.format("%s: %d - %s", output, card.number, card.suit));
+                }
+                pot.addAll(draws);
+                givePotOnWin();
+            }
+            if (size() == 0) {
+                Out.println("No winner in the game!");
+            } else {
+                Out.println(String.format("Player %s wins the game!", get(0).name));
             }
-            pot.addAll(draws);
-            givePotOnWin();
         }
-        Out.println(String.format("Player %s wins the game!", get(0).name));
     }
 
     private int playersLeft() {

src/PlayersTest.java

@@ -0,0 +1,73 @@
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PlayersTest {
+    Players players = new Players();
+
+    @BeforeEach
+    void setUp() {
+        Out.getOutput().clear();
+    }
+
+    @Test
+    void playForZeroPlayers() {
+        players.play();
+        assertEquals("", Out.get());
+    }
+
+    @Test
+    void playForOnePlayerMakesHimAWinner() {
+        Player player = new Player("0", Pile.createDeck(1));
+        players.add(player);
+        players.play();
+        assertEquals("Player 0 wins the game!\n", Out.get());
+    }
+
+    @Test
+    void playWithSameCardsHasNoWinner() {
+        Player player = new Player("0", Pile.createDeck(1));
+        players.add(player);
+        player = new Player("1", Pile.createDeck(1));
+        players.add(player);
+        players.play();
+        assertTrue(Out.get().contains("No winner in this round"));
+        assertTrue(Out.get().contains("No winner in the game!"));
+    }
+
+    @Test
+    void playWithTwoPlayers() {
+        Pile deck = new Pile();
+        deck.add(new Card(1, Card.Suit.CLUBS));
+        deck.add(new Card(2, Card.Suit.DIAMONDS));
+        deck.add(new Card(3, Card.Suit.HEARTS));
+        deck.add(new Card(4, Card.Suit.SPADES));
+        Player player = new Player("0", deck.take(2));
+        players.add(player);
+        player = new Player("1", deck.take(2));
+        players.add(player);
+        players.play();
+        assertTrue(Out.get().contains("Player 1 wins this round"));
+        assertTrue(Out.get().contains("Player 1 wins the game!"));
+    }
+
+    @Test
+    void playerOneWinningFourCards() {
+        Pile deck = new Pile();
+        deck.add(new Card(1, Card.Suit.CLUBS));
+        deck.add(new Card(2, Card.Suit.DIAMONDS));
+        deck.add(new Card(1, Card.Suit.HEARTS));
+        deck.add(new Card(4, Card.Suit.SPADES));
+        Player player = new Player("0", deck.take(2));
+        players.add(player);
+        player = new Player("1", deck.take(2));
+        players.add(player);
+        players.play();
+        assertTrue(Out.get().contains("No winner in this round"));
+        assertTrue(Out.get().contains("Player 1 wins this round"));
+        assertTrue(Out.get().contains("Player 1 wins the game!"));
+        assertEquals("1", players.get(0).name);
+        assertEquals(4, players.get(0).cardsCount());
+    }
+}