public function testComments()
{
$expectedElement = '/p:cmLst/p:cm';
$oAuthor = new Comment\Author();
$oComment = new Comment();
$oComment->setAuthor($oAuthor);
$this->oPresentation->getActiveSlide()->addShape($oComment);
$pres = TestHelperDOCX::getDocument($this->oPresentation, 'PowerPoint2007');
$this->assertTrue($pres->fileExists('ppt/comments/comment1.xml'));
$this->assertTrue($pres->elementExists($expectedElement, 'ppt/comments/comment1.xml'));
$this->assertEquals(0, $pres->getElementAttribute($expectedElement, 'authorId', 'ppt/comments/comment1.xml'));
}