public function testShouldThrowExceptionForUnknownFilter() { $view = new View(); $volt = new View\Engine\Volt($view); $exception = null; try { $volt->registerFilter('test'); } catch (\Exception $e) { $exception = $e; } $this->assertInstanceOf('\\Vegas\\Mvc\\View\\Engine\\Volt\\Exception\\UnknownFilterException', $exception); }