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

