public function testProductServiceGetProductById()
 {
     $productId = 5;
     $repository = $this->getMockBuilder(ObjectRepository::class)->getMock();
     $product = new Product();
     $repository->expects(self::once())->method('findOneBy')->with(['id' => $productId])->will(self::returnValue($product->setId($productId)));
     $service = new ProductService($repository);
     self::assertEquals($product->setId($productId), $service->getProductById($productId));
 }