@covers Symfony\Component\DependencyInjection\ContainerBuilder::createService
public function testCreateServiceFactoryService() {
$builder = new ContainerBuilder();
$builder
->register('baz_service')
->setFactoryService('baz_factory')
->setFactoryMethod('getInstance');
$builder
->register('baz_factory', 'BazClass');
$this
->assertInstanceOf('BazClass', $builder
->get('baz_service'));
}