public function testUpdateSpec()
 {
     $injector = new Injector();
     $services = array('AnotherService' => array('src' => TEST_SERVICES . '/AnotherService.php', 'properties' => array('filters' => array('One', 'Two'))));
     $injector->load($services);
     $injector->updateSpec('AnotherService', 'filters', 'Three');
     $another = $injector->get('AnotherService');
     $this->assertEquals(3, count($another->filters));
     $this->assertEquals('Three', $another->filters[2]);
 }