Sylius\Behat\Page\Admin\Promotion\CreatePageInterface::getValidationMessageForAction PHP Method

    public function getValidationMessageForAction();

 /**
  * @Then I should be notified that a percentage discount value must be at least 0%
  */
 public function iShouldBeNotifiedThatAPercentageDiscountValueMustBeAtLeast0()
 {
     Assert::same($this->createPage->getValidationMessageForAction(), 'The value of a percentage discount must be at least 0%.');
 }