public function testPointersToNodesAreNotLost()
{
$node = new SimpleDOM('<node>
<child letter="c" />
<child letter="d" />
<child letter="e" />
<child letter="a" />
<child letter="b" />
</node>');
$c = $node->child[0];
$d = $node->child[1];
$e = $node->child[2];
$a = $node->child[3];
$b = $node->child[4];
$node->sortChildren('@letter');
$a['old_letter'] = 'a';
$b['old_letter'] = 'b';
$c['old_letter'] = 'c';
$d['old_letter'] = 'd';
$e['old_letter'] = 'e';
$expected = '<node>
<child letter="a" old_letter="a" />
<child letter="b" old_letter="b" />
<child letter="c" old_letter="c" />
<child letter="d" old_letter="d" />
<child letter="e" old_letter="e" />
</node>';
$this->assertXmlStringEqualsXmlString($expected, $node->asXML());
}
