regress-211590.js - mozsearch

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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

//-----------------------------------------------------------------------------

var BUGNUMBER = 211590;

var summary = 'Math.random should be random';

var actual = '';

var expect = 'between 47.5% and 52.5%';

printBugNumber(BUGNUMBER);

printStatus (summary);

var r = Math.random;

var c = Math.pow( 2, 53 );

var n = 10000;

var odd1 = 0;

var odd2 = 0;

for ( var i = 0; i < n; ++i )

  var v= r() * c;

  if ( v & 1 )

    ++odd1;

  if ( v - c + c & 1 )

    ++odd2;

odd1 *= 100 / n;

odd2 *= 100 / n;

if (odd1 >= 47.5 && odd1 <= 52.5)

  actual = expect;

else

  actual = ' is ' + odd1.toFixed(3);

reportCompare(expect, actual, summary);

if (odd2 >= 47.5 && odd2 <= 52.5)

  actual = expect;

else

  actual = ' is ' + odd2.toFixed(3);

reportCompare(expect, actual, summary);