third_party/WebKit/LayoutTests/fast/dom/NodeIterator/NodeIterator-dont-overcollect.html

   1 <!DOCTYPE html>
   2 <html>
   3 <body>
   4 <script src="../../../resources/js-test.js"></script>
   5 <script>
   6     var callbackWasTriggered = false;
   7
   8     var callback = function(node) {
   9         callbackWasTriggered = true;
  10         return NodeFilter.FILTER_ACCEPT;
  11     };
  12     var nodeIterator = document.createNodeIterator(document, NodeFilter.SHOW_ELEMENT, callback, false);
  13
  14     var callbackObservation = internals.observeGC(callback);
  15     callback = null;
  16     var nodeFilterObservation = internals.observeGC(nodeIterator.filter);
  17     var nodeIteratorObservation = internals.observeGC(nodeIterator);
  18
  19     gc();
  20     shouldBeFalse('nodeFilterObservation.wasCollected');
  21     shouldBeFalse('callbackObservation.wasCollected');
  22
  23     nodeIterator.nextNode();
  24     shouldBeTrue('callbackWasTriggered');
  25
  26     nodeIterator = null;
  27     gc();
  28     shouldBeTrue('nodeIteratorObservation.wasCollected');
  29     shouldBeTrue('nodeFilterObservation.wasCollected');
  30     shouldBeTrue('callbackObservation.wasCollected');
  31 </script>
  32 </body>
  33 </html>