test_xrayed_iterator.js

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  Services.prefs.clearUserPref("security.allow_eval_with_system_principal");

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function run_test() {

  var toEval = [

    "var customIterator = {",

    "  _array: [6, 7, 8, 9]",

    "};",

    "customIterator[Symbol.iterator] = function* () {",

    "    for (var i = 0; i < this._array.length; ++i)",

    "      yield this._array[i];",

    "};"

  ].join('\n');

  function checkIterator(iterator) {

    var control = [6, 7, 8, 9];

    var i = 0;

    for (var item of iterator) {

      Assert.equal(item, control[i]);

      ++i;

  // First, try in our own scope.

  eval(toEval);

  checkIterator(customIterator);

  // Next, try a vanilla CCW.

  var sbChrome = Cu.Sandbox(this);

  Cu.evalInSandbox(toEval, sbChrome, '1.7');

  checkIterator(sbChrome.customIterator);

  // Finally, try an Xray waiver.

  var sbContent = Cu.Sandbox('http://www.example.com');

  Cu.evalInSandbox(toEval, sbContent, '1.7');

  checkIterator(Cu.waiveXrays(sbContent.customIterator));