
    var after = document.createElement('div');
    noDistribute.insertBefore(before, child);
    noDistribute.appendChild(after);
    flush();
    assert.equal(noDistribute.firstChild, before, 'firstChild incorrect');
    assert.equal(noDistribute.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');
    a