veChildren(d, function (info) {
            recorded = info;
          });
          var child1 = document.createElement('div');
          ShadyDOM.wrapIfNeeded(d).appendChild(child1);
          observer.takeRecords();
          assert.equal(recorded, null);
        });

        test('observeChildren async', function (done) {
          var d = document.createElement('div');
          makeShadowRootWithSlot(d);
          var recorded = null;
          var observer = ShadyDOM.observeChildren(d, function (info