nted due to element addition');
    nd.appendChild(b);
    flush();
    assert.equal(nd.children.length, 2, 'children length not incremented due to element addition');
    assert.equal(nd.root.children.length, 1, 'root children length not decremented due to element removal');
  });

  test('modifying slots correctly distributes changes to light dom', function() {
    function testNoAttr() {
      assert.equal(allInsertionPoints(child)[0], d.$.notTestContent, 'child not distributed logically');
      if (che