public function testGetSetAuthor()
{
$object = new Comment();
$oStub = $this->getMock('PhpOffice\\PhpPresentation\\Shape\\Comment\\Author');
$this->assertNull($object->getAuthor());
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Comment', $object->setAuthor($oStub));
$this->assertInstanceOf('PhpOffice\\PhpPresentation\\Shape\\Comment\\Author', $object->getAuthor());
}