public function testCDATACannotBeTricked()
{
$root = new SimpleDOM('<root />');
$expected = '<root><![CDATA[<![CDATA[some data]]]]><![CDATA[>]]></root>';
$root->insertCDATA('<![CDATA[some data]]>', 'append');
$this->assertXmlStringEqualsXmlString($expected, $root->asXML());
}