ssert.equal(d.childNodes.length, 2);
  assert.equal(d.firstChild, c);
  assert.equal(d.lastChild, c1);
});

test('appendChild interacts with unmanaged parent tree', function() {
  var container = document.querySelector('#container');
  var echo = container.firstElementChild;
  assert.equal(echo.localName, 'x-echo');
  var s1 = echo.nextElementSibling;
  assert.equal(s1.textContent, '1');
  var s2 = s1.nextElementSibling;
  assert.equal(s2.textContent, '2');
  assert.equal(container.children.length, 3);
  ec