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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);
}
}