chromium/third_party/blink/web_tests/fast/js/regress/script-tests/fold-double-to-int.js

// Copyright 2008 the V8 project authors. All rights reserved.
// Copyright (C) 2013 Apple Inc. All rights reserved.
//
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// V8's random function.
Math.random = (function() {
  var seed = 49734321;
  return function() {
    // Robert Jenkins' 32 bit integer hash function.
    seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
    seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
    seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;
    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
    seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;
    seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;
    return (seed & 0xfffffff) / 0x10000000;
  };
})();

x = 0;

for (var i = 0; i < 1000000; ++i)
    x += Math.random();

if (Math.round(x) != 499823) {
    throw "Bad result from my random function: " + x;
}