test/suite/ch15/15.4/15.4.4/15.4.4.18/15.4.4.18-8-7.js


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/// Copyright (c) 2012 Ecma International.  All rights reserved. 
/// Ecma International makes this code available under the terms and conditions set
/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
/// "Use Terms").   Any redistribution of this code must retain the above 
/// copyright and this notice and otherwise comply with the Use Terms.
/**
 * @path ch15/15.4/15.4.4/15.4.4.18/15.4.4.18-8-7.js
 * @description Array.prototype.forEach doesn't call callbackfn if 'length' is 0 (subclassed Array, length overridden with obj w/o valueOf (toString))
 */


function testcase() {
  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  
  var o = { toString: function () { return '0';}};
  f.length = o;
  
  // objects inherit the default valueOf method of the Object object;
  // that simply returns the itself. Since the default valueOf() method
  // does not return a primitive value, ES next tries to convert the object
  // to a number by calling its toString() method and converting the
  // resulting string to a number.
  var callCnt = 0;
  function cb(){callCnt++}
  var i = f.forEach(cb);  
  if (callCnt === 0) {
    return true;
  }
 }
runTestCase(testcase);