public function testTranslationOfNoteVisibilityValues()
 {
     $model = new Opus_Note();
     $values = $model->getField('Visibility')->getDefault();
     foreach ($values as $value) {
         $key = $this->helper->getKeyForValue('Opus_Note', 'Visibility', $value);
         $this->assertNotEquals($key, $this->translate->translate($key), 'Translation key \'' . $key . '\' is missing.');
     }
 }