public function testCommentVisible()
{
$expectedElement = '/p:viewPr';
$oPhpPresentation = new PhpPresentation();
$oPhpPresentation->getPresentationProperties()->setCommentVisible(true);
$oXMLDoc = TestHelperDOCX::getDocument($oPhpPresentation, 'PowerPoint2007');
$this->assertTrue($oXMLDoc->fileExists('ppt/viewProps.xml'));
$this->assertTrue($oXMLDoc->elementExists($expectedElement, 'ppt/viewProps.xml'));
$this->assertEquals(1, $oXMLDoc->getElementAttribute($expectedElement, 'showComments', 'ppt/viewProps.xml'));
}