AssertProductSpecialPriceOnProductPage.php

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<?php
namespace Magento\Catalog\Test\Constraint;

use Magento\Catalog\Test\Block\Product\View;
use Magento\Catalog\Test\Page\Product\CatalogProductView;
use Magento\Mtf\Client\BrowserInterface;
use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Mtf\Fixture\FixtureInterface;

class AssertProductSpecialPriceOnProductPage extends AbstractConstraint implements AssertPriceOnProductPageInterface
{
    protected $errorMessage = 'Assert that displayed special price on product page NOT equals to passed from fixture.';

    public function processAssert(
        CatalogProductView $catalogProductView,
        BrowserInterface $browser,
        FixtureInterface $product
    ) {
        $browser->open($_ENV['app_frontend_url'] . $product->getUrlKey() . '.html');

        //Process assertions
        $this->assertPrice($product, $catalogProductView->getViewBlock());
    }

    public function setErrorMessage($errorMessage)
    {
        $this->errorMessage = $errorMessage;
    }

    public function assertPrice(FixtureInterface $product, View $productViewBlock)
    {
        $fields = $product->getData();
        $specialPrice = $productViewBlock->getPriceBlock($product)->getSpecialPrice();
        if (isset($fields['special_price'])) {
            \PHPUnit\Framework\Assert::assertEquals(
                number_format($fields['special_price'], 2),
                $specialPrice,
                $this->errorMessage
            );
        }
    }

    public function toString()
    {
        return "Assert that displayed special price on product page equals passed from fixture.";
    }
}