public function testIsConnector()
 {
     $connector1 = $this->authoringService->createConnector($this->activity);
     $this->authoringService->setConnectorType($connector1, new core_kernel_classes_Resource(INSTANCE_TYPEOFCONNECTORS_SEQUENCE));
     $activity2 = $this->authoringService->createSequenceActivity($connector1, null, 'activity2');
     $this->assertTrue($this->service->isConnector($connector1));
     $this->assertFalse($this->service->isConnector($activity2));
     $connector1->delete(true);
     $activity2->delete(true);
 }