Автор: Mateusz Zalewski (mateusz.zalewski@lakion.com)
Наследование: extends Symfony\Component\Templating\Helper\Helper
 function it_uses_helper_to_get_variants_prices(ProductInterface $product, ProductVariantsPricesHelper $productVariantsPricesHelper)
 {
     $productVariantsPricesHelper->getPrices($product)->willReturn([['color' => 'purple', 'value' => 12345]]);
     $this->getVariantsPrices($product)->shouldReturn([['color' => 'purple', 'value' => 12345]]);
 }
 /**
  * @param ProductInterface $product
  *
  * @return array
  */
 public function getVariantsPrices(ProductInterface $product)
 {
     return $this->productVariantsPricesHelper->getPrices($product);
 }