failed test backbone

destroyLoop.js

  test("destroy models in each loop", 4, function() {
    var collection = new Backbone.Collection([{id: 1}, {id: 2}, {id: 3}, {id: 4}]);
    collection.each(function(model) {
      notStrictEqual(model, undefined);
      if (model !== undefined) {
        model.destroy({url: function() {}});
      }
    });
  });