js/tests/js1_5/Regress/regress-211590.js

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
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  15  * The Original Code is JavaScript Engine testing utilities.
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  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s): zack-weg@gmx.de
  23  *                 Bob Clary <bob@bclary.com>
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 var gTestfile = 'regress-211590.js';
  40 //-----------------------------------------------------------------------------
  41 var BUGNUMBER = 211590;
  42 var summary = 'Math.random should be random';
  43 var actual = '';
  44 var expect = 'between 48% and 52%';
  45
  46 printBugNumber(BUGNUMBER);
  47 printStatus (summary);
  48
  49 var r = Math.random;
  50 var c = Math.pow( 2, 53 );
  51
  52 var n = 10000;
  53 var odd1 = 0;
  54 var odd2 = 0;
  55
  56 for ( var i = 0; i < n; ++i )
  57 {
  58   var v= r() * c;
  59   if ( v & 1 )
  60     ++odd1;
  61   if ( v - c + c & 1 )
  62     ++odd2;
  63 }
  64
  65 odd1 *= 100 / n;
  66 odd2 *= 100 / n;
  67
  68 if (odd1 >= 48 && odd1 <= 52)
  69 {
  70   actual = expect;
  71 }
  72 else
  73 {
  74   actual = ' is ' + odd1.toFixed(3);
  75 }
  76
  77 reportCompare(expect, actual, summary);
  78
  79 if (odd2 >= 48 && odd2 <= 52)
  80 {
  81   actual = expect;
  82 }
  83 else
  84 {
  85   actual = ' is ' + odd2.toFixed(3);
  86 }
  87
  88 reportCompare(expect, actual, summary);