public function testGetModel()
 {
     $form = new Admin_Form_PersonLink();
     $this->assertNull($form->getModel());
     $document = new Opus_Document(250);
     $authors = $document->getPersonAuthor();
     $this->assertEquals(3, count($authors));
     $form->populateFromModel($authors[0]);
     $this->assertEquals($authors[0], $form->getModel());
 }