on() {
      el = document.createElement('x-test');
      let d = document.createElement('div');
      d.textContent = 'content';
      el.appendChild(d);
      document.body.appendChild(el);
      ShadyDOM.flush();
    });

    teardown(function() {
      el.parentNode.removeChild(el);
    });

    test('appendChild', function() {
      let d = document.createElement('div');
      ShadyDOM.nativeMethods.appendChild.call(el, d);
      assert.equal(ShadyDOM.nativeTree.lastChild(el), d);
    });

    test('in