public function testComplexFilter()
 {
     $task1 = new Task();
     $task1->setDescription('foo1');
     $this->taskManager->save($task1);
     $this->assertCount(1, $this->taskManager->filter('(status:pending or status:waiting)'));
     $this->assertCount(1, $this->taskManager->findPending('(status:pending or status:waiting)'));
 }