GraphAware\Reco4PHP\RecommenderService::registerRecommendationEngine PHP Method

    public function registerRecommendationEngine(RecommendationEngine $recommendationEngine)
    {
        $recommendationEngine->setDatabaseService($this->databaseService);
        $this->engines[$recommendationEngine->name()] = $recommendationEngine;
    }

 /**
  * @setUp()
  */
 public function setUp()
 {
     $this->recoService = RecommenderService::create('http://localhost:7474');
     $this->recoService->registerRecommendationEngine(new RecoEngine());
     $this->client = ClientBuilder::create()->addConnection('default', 'http://localhost:7474')->build();
     $this->createGraph();
 }