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-<!DOCTYPE html>
-<html>
-<!--
-Copyright 2009 The Closure Library Authors. All Rights Reserved.
-
-Use of this source code is governed by the Apache License, Version 2.0.
-See the COPYING file for details.
--->
-<head>
-<meta http-equiv="X-UA-Compatible" content="IE=edge">
-<title>Closure Unit Tests - goog.testing.PseudoRandom</title>
-<script src="../base.js"></script>
-<script>
- goog.require('goog.testing.PseudoRandom');
- goog.require('goog.testing.jsunit');
-</script>
-</head>
-<body>
-<script>
-
- function runFairnessTest(sides, rolls, chiSquareLimit) {
- // Initialize the count table for dice rolls.
- var counts = [];
- for (var i = 0; i < sides; ++i) {
- counts[i] = 0;
- }
- // Roll the dice many times and count the results.
- for (var i = 0; i < rolls; ++i) {
- ++counts[Math.floor(Math.random() * sides)];
- }
- // If the dice is fair, we expect a uniform distribution.
- var expected = rolls / sides;
- // Pearson's chi-square test for a distribution fit.
- var chiSquare = 0
- for (var i = 0; i < sides; ++i) {
- chiSquare += (counts[i] - expected) * (counts[i] - expected) / expected;
- }
- assert('Chi-square test for a distribution fit failed',
- chiSquare < chiSquareLimit);
- }
-
- function testInstall() {
- var random = new goog.testing.PseudoRandom();
- var originalRandom = Math.random;
-
- assertFalse(!!random.installed_);
-
- random.install();
- assertTrue(random.installed_);
- assertNotEquals(Math.random, originalRandom);
-
- random.uninstall();
- assertFalse(random.installed_);
- assertEquals(originalRandom, Math.random);
- }
-
- function testBounds() {
- var random = new goog.testing.PseudoRandom();
- random.install();
-
- for (var i = 0; i < 100000; ++i) {
- var value = Math.random();
- assert('Random value out of bounds', value >= 0 && value < 1);
- }
-
- random.uninstall();
- }
-
- function testFairness() {
- var random = new goog.testing.PseudoRandom(0, true);
-
- // Chi-square statistics: p-value = 0.05, df = 5, limit = 11.07.
- runFairnessTest(6, 100000, 11.07);
- // Chi-square statistics: p-value = 0.05, df = 100, limit = 124.34.
- runFairnessTest(101, 100000, 124.34);
-
- random.uninstall();
- }
-
- function testReseed() {
- var random = new goog.testing.PseudoRandom(100, true);
-
- var sequence = [];
- for (var i = 0; i < 64000; ++i) {
- sequence.push(Math.random());
- }
-
- random.seed(100);
- for (var i = 0; i < sequence.length; ++i) {
- assertEquals(sequence[i], Math.random());
- }
-
- random.uninstall();
- }
-
-</script>
-</body>
-</html>