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/*
* DSI utilities
*
* Copyright (C) 2014-2023 Sebastiano Vigna
*
* This program and the accompanying materials are made available under the
* terms of the GNU Lesser General Public License v2.1 or later,
* which is available at
* http://www.gnu.org/licenses/old-licenses/lgpl-2.1-standalone.html,
* or the Apache Software License 2.0, which is available at
* https://www.apache.org/licenses/LICENSE-2.0.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
*
* SPDX-License-Identifier: LGPL-2.1-or-later OR Apache-2.0
*/
package it.unimi.dsi.util;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
public class XoShiRo256PlusPlusRandomTest {
private final static long seeds[] = { 0, 1, 1024, 0x5555555555555555L };
@Test
public void testNextFloat() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
double avg = 0;
for (int i = 1000000; i-- != 0;) {
final float d = xoshiro.nextFloat();
assertTrue(Float.toString(d), d < 1);
assertTrue(Float.toString(d), d >= 0);
avg += d;
}
assertEquals(500000, avg, 1000);
}
}
@Test
public void testNextDouble() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
double avg = 0;
for (int i = 1000000; i-- != 0;) {
final double d = xoshiro.nextDouble();
assertTrue(d < 1);
assertTrue(d >= 0);
avg += d;
}
assertEquals(500000, avg, 1000);
}
}
@Test
public void testNextDoubleFast() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
double avg = 0;
for (int i = 1000000; i-- != 0;) {
final double d = xoshiro.nextDoubleFast();
assertTrue(d < 1);
assertTrue(d >= 0);
avg += d;
}
assertEquals(500000, avg, 1000);
}
}
@Test
public void testNextInt() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
double avg = 0;
for (int i = 100000000; i-- != 0;) {
final int d = xoshiro.nextInt(101);
assertTrue(d <= 100);
assertTrue(d >= 0);
avg += d;
}
assertEquals(5000000000L, avg, 1000000);
}
}
@Test
public void testNextInt2() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
final int[] count = new int[32];
long change = 0;
int prev = 0;
for (int i = 1000000; i-- != 0;) {
final int d = xoshiro.nextInt();
change += Long.bitCount(d ^ prev);
for (int b = 32; b-- != 0;)
if ((d & (1 << b)) != 0) count[b]++;
prev = d;
}
assertEquals(32 * 1000000L, change, 38000);
for (int b = 32; b-- != 0;) assertEquals(500000, count[b], 2000);
}
}
@Test
public void testNextInt3() {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(0);
for(int i = 0; i < 100; i++) assertTrue(xoshiro.nextInt(16) < 16);
}
@Test
public void testNextInt4() {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(0);
assertEquals(0, xoshiro.nextInt(1));
}
@Test
public void testNextLong() {
for (final long seed : seeds) {
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom(seed);
final int[] count = new int[64];
long change = 0;
long prev = 0;
for (int i = 1000000; i-- != 0;) {
final long d = xoshiro.nextLong();
change += Long.bitCount(d ^ prev);
for (int b = 64; b-- != 0;)
if ((d & (1L << b)) != 0) count[b]++;
prev = d;
}
assertEquals(32 * 1000000L, change, 6000);
for (int b = 64; b-- != 0;) assertEquals(500000, count[b], 2000);
}
}
@Test
public void testRight() {
final long[] init = { 0x7743a154e17a5e9bL, 0x7823a1cd9453899bL, 0x976589eefbb1c7f5L, 0x702cf168260fa29eL };
final long[] orbit = { 0xd5c766557e6e16e4L, 0xf8eb8f8747a8cc67L, 0xfc18365710a653eeL, 0xc698a193593f232L, 0xa44ddeaac93b1be7L, 0x678dcd0e0516c741L, 0x351d94668d7c35eL, 0x73160e24fc8768daL, 0x562ca11220c31698L, 0x3dba336235c48913L };
final XoShiRo256PlusPlusRandom xoshiro = new XoShiRo256PlusPlusRandom();
xoshiro.setState(init);
for(int i = 0; i < 10; i++) assertEquals(orbit[i], xoshiro.nextLong());
xoshiro.setState(init);
xoshiro.jump();
final long[] jump = { 0x39c4396d8759c874L, 0x4b948d9de69752ecL, 0x871591604b03d9a6L, 0x444d6d471322d17bL, 0xb0a9eb9383bf0803L, 0x481f6c796c1d0ecaL, 0xb89a346b480341bfL, 0x1494bad1d1b19126L, 0xa2f5ca0a0ab0805L, 0x75a4de1da308cc8fL };
for(int i = 0; i < 10; i++) assertEquals(jump[i], xoshiro.nextLong());
xoshiro.setState(init);
xoshiro.longJump();
final long[] longJump = { 0xea14aabc151743b5L, 0x8941269998260040L, 0x4cf6a8517950ced8L, 0x2c657736be0af94cL, 0x9ce62322d721ea8fL, 0x6f2e0950267a4252L, 0x5ac6463cf03b2904L, 0x630400b3a65ac6c0L, 0xa220c012240ddeb0L, 0x9b1b712840162f46L };
for(int i = 0; i < 10; i++) assertEquals(longJump[i], xoshiro.nextLong());
}
}
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