first commit

Tennis/java/factored1/TennisGame.java

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+package factored1;
+
+public class TennisGame {
+
+	public static final String[] POINTS = new String[]{"Love", "Fifteen", "Thirty", "Forty"}; 
+	
+	private int player2Score;
+	private int player1Score;
+	
+	private String player1Name;
+	private String player2Name;
+
+	public TennisGame(String player1Name, String player2Name) {
+		this.player1Name = player1Name;
+		this.player2Name = player2Name;
+	}
+
+	public String getScore() {
+		if (someoneHasWon())
+			return "Win for " + winningPlayerName();
+
+		if (isEndgame()) {
+			if (pointsAreEven())
+				return "Deuce";
+			else
+				return "Advantage " + winningPlayerName();
+		} else {
+			if (pointsAreEven())
+				return POINTS[player1Score] + "-All";
+			else  {
+				return POINTS[player1Score] + "-" + POINTS[player2Score];
+			} 
+		}
+	}
+
+	public boolean someoneHasWon() {
+		return isEndgame() && (player1Score-player2Score >= 2 || player2Score-player1Score >= 2);
+	}
+
+	private boolean pointsAreEven() {
+		return player1Score == player2Score;
+	}
+
+	private boolean isEndgame() {
+		return player1Score > 3 || player2Score > 3;
+	}
+	
+	public String winningPlayerName() {
+		if (player1Score > player2Score)
+			return player1Name;
+		else
+			return player2Name;
+	}
+
+	public void wonPoint(String playerName) {
+		if (playerName == player1Name)
+			this.player1Score += 1;
+		else
+			this.player2Score += 1;
+		
+	}
+
+}

Tennis/java/factored1/TennisTest.java

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+package factored1;
+
+import static org.junit.Assert.*;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class TennisTest {
+
+	private int player1Score;
+	private int player2Score;
+	private String expectedScore;
+
+	public TennisTest(int player1Score, int player2Score, String expectedScore) {
+		this.player1Score = player1Score;
+		this.player2Score = player2Score;
+		this.expectedScore = expectedScore;
+	}
+	
+	@Parameters
+	public static Collection<Object[]> getAllScores() {
+		return Arrays.asList(new Object[][] {
+				{ 0, 0, "Love-All" },
+				{ 1, 1, "Fifteen-All" },
+				{ 2, 2, "Thirty-All"},
+				{ 3, 3, "Forty-All"},
+				{ 4, 4, "Deuce"},
+				
+				{ 1, 0, "Fifteen-Love"},
+				{ 0, 1, "Love-Fifteen"},
+				{ 2, 0, "Thirty-Love"},
+				{ 0, 2, "Love-Thirty"},
+				{ 3, 0, "Forty-Love"},
+				{ 0, 3, "Love-Forty"},
+				{ 4, 0, "Win for player1"},
+				{ 0, 4, "Win for player2"},
+				
+				{ 2, 1, "Thirty-Fifteen"},
+				{ 1, 2, "Fifteen-Thirty"},
+				{ 3, 1, "Forty-Fifteen"},
+				{ 1, 3, "Fifteen-Forty"},
+				{ 4, 1, "Win for player1"},
+				{ 1, 4, "Win for player2"},
+
+				{ 3, 2, "Forty-Thirty"},
+				{ 2, 3, "Thirty-Forty"},
+				{ 4, 2, "Win for player1"},
+				{ 2, 4, "Win for player2"},
+				
+				{ 4, 3, "Advantage player1"},
+				{ 3, 4, "Advantage player2"},
+				{ 5, 4, "Advantage player1"},
+				{ 4, 5, "Advantage player2"},
+				{ 15, 14, "Advantage player1"},
+				{ 14, 15, "Advantage player2"},
+
+				{ 6, 4, "Win for player1"},
+				{ 4, 6, "Win for player2"},
+				{ 16, 14, "Win for player1"},
+				{ 14, 16, "Win for player2"},
+		});
+	}
+
+	@Test
+	public void checkAllScores() {
+		TennisGame game = new TennisGame("player1", "player2");
+		for (int i = 0; i < this.player1Score; i++) 
+			game.wonPoint("player1");
+		for (int i = 0; i < this.player2Score; i++) 
+			game.wonPoint("player2");
+		assertEquals(this.expectedScore, game.getScore());
+	}
+	
+	@Test
+	public void realisticGame() {
+		TennisGame game = new TennisGame("player1", "player2");
+		String[] points =          {"player1", "player1", "player2", "player2", "player1", "player1"};
+		String[] expected_scores = {"Fifteen-Love", "Thirty-Love", "Thirty-Fifteen", "Thirty-All", "Forty-Thirty", "Win for player1"};
+		for (int i = 0; i < 6; i++) {
+			game.wonPoint(points[i]);
+			assertEquals(expected_scores[i], game.getScore());
+		}
+		
+		
+	}
+
+}