/**
  * Verify displayed product price on product page(front-end) equals passed from fixture
  *
  * @return string|null
  */
 protected function verifyPrice()
 {
     $fixtureProductPrice = number_format($this->product->getPrice(), 2);
     $formProductPrice = $this->productView->getPriceBlock()->getRegularPrice();
     if ($fixtureProductPrice == $formProductPrice) {
         return null;
     }
     return "Displayed product price on product page(front-end) not equals passed from fixture. " . "Actual: {$formProductPrice}, expected: {$fixtureProductPrice}.";
 }