public function testSetFlagsFailure()
 {
     $col = new ezcPersistentRelationCollection();
     try {
         $col->setFlags(ArrayObject::ARRAY_AS_PROPS);
     } catch (ezcBaseValueException $e) {
     }
     try {
         $col->setFlags(ArrayObject::STD_PROP_LIST);
     } catch (ezcBaseValueException $e) {
     }
     try {
         $col->setFlags('foo');
     } catch (ezcBaseValueException $e) {
     }
 }