LayoutTests/ietestcenter/Javascript/TestCases/15.4.4.21-7-6.js

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ES5Harness.registerTest( {
id: "15.4.4.21-7-6",

path: "TestCases/chapter15/15.4/15.4.4/15.4.4.21/15.4.4.21-7-6.js",

description: "Array.prototype.reduce returns initialValue if 'length' is 0 and initialValue is present (subclassed Array, length overridden with obj with valueOf)",

test: function testcase() {
  foo.prototype = new Array(1, 2, 3);
  function foo() {}
  var f = new foo();
  
  var o = { valueOf: function () { return 0;}};
  f.length = o;
  
  function cb(){}
  try {
    if(f.reduce(cb,1) === 1)
      return true;
  }
  catch (e) {  }  
 },

precondition: function prereq() {
  return fnExists(Array.prototype.reduce);
 }
});