Add user rating using Glicko rating system (#1498)

Mage.Tests/src/test/java/org/mage/test/serverside/rating/GlickoRatingSystemTest.java

@@ -0,0 +1,169 @@
+/*
+ *  Copyright 2011 BetaSteward_at_googlemail.com. All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without modification, are
+ *  permitted provided that the following conditions are met:
+ *
+ *     1. Redistributions of source code must retain the above copyright notice, this list of
+ *        conditions and the following disclaimer.
+ *
+ *     2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *        of conditions and the following disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY BetaSteward_at_googlemail.com ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ *  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BetaSteward_at_googlemail.com OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ *  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  The views and conclusions contained in the software and documentation are those of the
+ *  authors and should not be interpreted as representing official policies, either expressed
+ *  or implied, of BetaSteward_at_googlemail.com.
+ */
+package org.mage.test.serverside.rating;
+
+import org.junit.Assert;
+import mage.server.rating.GlickoRating;
+import mage.server.rating.GlickoRatingSystem;
+import org.junit.Test;
+
+import java.util.Random;
+
+/**
+ *
+ * @author Quercitron
+ */
+public class GlickoRatingSystemTest {
+
+    private final Random random = new Random();
+
+    @Test
+    public void testRatingsAreEqualAfterDraws() {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        int count = 1000;
+        for (int i = 0; i < count; i++) {
+            double startRating = random.nextDouble() * 2500 + 500;
+            double startRatingDeviation = Math.min(random.nextDouble() * 300 + 100, GlickoRatingSystem.BaseRD);
+            GlickoRating player1 = new GlickoRating(startRating, startRatingDeviation, 1);
+            GlickoRating player2 = new GlickoRating(startRating, startRatingDeviation, 1);
+
+            int gamesCount = random.nextInt(50) + 1;
+
+            for (int j = 0; j < gamesCount; j++) {
+                glickoRatingSystem.updateRating(player1, player2, 0.5, j + 2);
+                Assert.assertEquals(player1.getRating(), player2.getRating(), 1e-5);
+                Assert.assertEquals(player1.getRatingDeviation(), player2.getRatingDeviation(), 1e-5);
+            }
+        }
+    }
+
+    @Test
+    public void testRatingChangesAreSymmetric() {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        int count = 1000;
+        for (int i = 0; i < count; i++) {
+            double startRating1 = random.nextDouble() * 2500 + 500;
+            double startRating2 = random.nextDouble() * 2500 + 500;
+            double startRatingDeviation = Math.min(random.nextDouble() * 300 + 100, GlickoRatingSystem.BaseRD);
+            GlickoRating player1 = new GlickoRating(startRating1, startRatingDeviation, 1);
+            GlickoRating player2 = new GlickoRating(startRating2, startRatingDeviation, 1);
+
+            glickoRatingSystem.updateRating(player1, player2, random.nextDouble(), 1);
+            Assert.assertEquals(player1.getRating() - startRating1, startRating2 - player2.getRating(), 1e-5);
+            Assert.assertEquals(player1.getRatingDeviation(), player2.getRatingDeviation(), 1e-5);
+        }
+    }
+
+    @Test
+    public void testExactResult1()
+    {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        GlickoRating player1 = new GlickoRating(1500, 350, 1);
+        GlickoRating player2 = new GlickoRating(1500, 350, 1);
+
+        glickoRatingSystem.updateRating(player1, player2, 1, 1);
+
+        Assert.assertEquals(1662, player1.getRating(), 1);
+        Assert.assertEquals(290.2, player1.getRatingDeviation(), 0.1);
+
+        Assert.assertEquals(1338, player2.getRating(), 1);
+        Assert.assertEquals(290.2, player2.getRatingDeviation(), 0.1);
+    }
+
+    @Test
+    public void testExactResult2()
+    {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        GlickoRating player1 = new GlickoRating(1500, 350, 1);
+        GlickoRating player2 = new GlickoRating(1200, 50, 1);
+
+        glickoRatingSystem.updateRating(player1, player2, 1, 1);
+
+        Assert.assertEquals(1571, player1.getRating(), 1);
+        Assert.assertEquals(284.3, player1.getRatingDeviation(), 0.1);
+
+        Assert.assertEquals(1198, player2.getRating(), 1);
+        Assert.assertEquals(49.8, player2.getRatingDeviation(), 0.1);
+    }
+
+    @Test
+    public void testExactResult3()
+    {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        GlickoRating player1 = new GlickoRating(1500, 350, 1);
+        GlickoRating player2 = new GlickoRating(1200, 50, 1);
+
+        glickoRatingSystem.updateRating(player1, player2, 0, 1);
+
+        Assert.assertEquals(1111, player1.getRating(), 1);
+        Assert.assertEquals(284.3, player1.getRatingDeviation(), 0.1);
+
+        Assert.assertEquals(1207, player2.getRating(), 1);
+        Assert.assertEquals(49.8, player2.getRatingDeviation(), 0.1);
+    }
+
+    @Test
+    public void testExactResult4()
+    {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        GlickoRating player1 = new GlickoRating(1500, 250, 1);
+        GlickoRating player2 = new GlickoRating(2000, 100, 1);
+
+        glickoRatingSystem.updateRating(player1, player2, 0.5, 1);
+
+        Assert.assertEquals(1636, player1.getRating(), 1);
+        Assert.assertEquals(237.6, player1.getRatingDeviation(), 0.1);
+
+        Assert.assertEquals(1982, player2.getRating(), 1);
+        Assert.assertEquals(99.1, player2.getRatingDeviation(), 0.1);
+    }
+
+    @Test
+    public void testExactResult5()
+    {
+        GlickoRatingSystem glickoRatingSystem = new GlickoRatingSystem();
+
+        GlickoRating player1 = new GlickoRating(1500, 100, 1);
+        GlickoRating player2 = new GlickoRating(2000, 100, 1);
+
+        glickoRatingSystem.updateRating(player1, player2, 1, 1);
+
+        Assert.assertEquals(1551, player1.getRating(), 1);
+        Assert.assertEquals(99.2, player1.getRatingDeviation(), 0.1);
+
+        Assert.assertEquals(1949, player2.getRating(), 1);
+        Assert.assertEquals(99.2, player2.getRatingDeviation(), 0.1);
+    }
+
+}