michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: var BUGNUMBER = 211590;
michael@0: var summary = 'Math.random should be random';
michael@0: var actual = '';
michael@0: var expect = 'between 47.5% and 52.5%';
michael@0: 
michael@0: printBugNumber(BUGNUMBER);
michael@0: printStatus (summary);
michael@0:  
michael@0: var r = Math.random;
michael@0: var c = Math.pow( 2, 53 );
michael@0: 
michael@0: var n = 10000;
michael@0: var odd1 = 0;
michael@0: var odd2 = 0;
michael@0: 
michael@0: for ( var i = 0; i < n; ++i )
michael@0: {
michael@0:   var v= r() * c;
michael@0:   if ( v & 1 )
michael@0:     ++odd1;
michael@0:   if ( v - c + c & 1 )
michael@0:     ++odd2;
michael@0: }
michael@0: 
michael@0: odd1 *= 100 / n;
michael@0: odd2 *= 100 / n;
michael@0: 
michael@0: if (odd1 >= 47.5 && odd1 <= 52.5)
michael@0: {
michael@0:   actual = expect;
michael@0: }
michael@0: else
michael@0: {
michael@0:   actual = ' is ' + odd1.toFixed(3);
michael@0: }
michael@0: 
michael@0: reportCompare(expect, actual, summary);
michael@0: 
michael@0: if (odd2 >= 47.5 && odd2 <= 52.5)
michael@0: {
michael@0:   actual = expect;
michael@0: }
michael@0: else
michael@0: {
michael@0:   actual = ' is ' + odd2.toFixed(3);
michael@0: }
michael@0: 
michael@0: reportCompare(expect, actual, summary);