ssert.equal(after.nextSibling, null, 'nextSibling incorrect');
    assert.equal(child.previousSibling, before, 'previousSibling incorrect');
  });

  test('node accessors (distribute)', function() {
    var child = distribute.children[0];
    assert.isTrue(child.classList.contains('child'), 'test node could not be found');
    var before = document.createElement('div');
    var after = document.createElement('div');
    distribute.insertBefore(before, child);
    distribute.appendChild(after);
    flush();
