Sylius\Behat\Page\Admin\Order\ShowPageInterface::hasPromotionDiscount PHP Method

    public function hasPromotionDiscount($promotionDiscount);

 /**
  * @Then the order's promotion discount should be :promotionDiscount
  */
 public function theOrdersPromotionDiscountShouldBe($promotionDiscount)
 {
     Assert::true($this->showPage->hasPromotionDiscount($promotionDiscount), sprintf('Promotion discount is not "%s".', $promotionDiscount));
 }