public function testRender()
{
$oPhpPresentation = new PhpPresentation();
$oXMLDoc = TestHelperDOCX::getDocument($oPhpPresentation, 'PowerPoint2007');
$this->assertTrue($oXMLDoc->fileExists('ppt/presProps.xml'));
$element = '/p:presentationPr/p:extLst/p:ext';
$this->assertTrue($oXMLDoc->elementExists($element, 'ppt/presProps.xml'));
$this->assertEquals('{E76CE94A-603C-4142-B9EB-6D1370010A27}', $oXMLDoc->getElementAttribute($element, 'uri', 'ppt/presProps.xml'));
}