AssertProductAttributeIsComparable.php

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

use Magento\Catalog\Test\Fixture\CatalogProductAttribute;
use Magento\Catalog\Test\Page\Product\CatalogProductCompare;
use Magento\Catalog\Test\Page\Product\CatalogProductView;
use Magento\Mtf\Client\BrowserInterface;
use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Mtf\Fixture\InjectableFixture;

class AssertProductAttributeIsComparable extends AbstractConstraint
{
    public function processAssert(
        InjectableFixture $product,
        CatalogProductAttribute $attribute,
        BrowserInterface $browser,
        CatalogProductView $catalogProductView,
        CatalogProductCompare $catalogProductCompare
    ) {
        $browser->open($_ENV['app_frontend_url'] . $product->getUrlKey() . '.html');
        $catalogProductView->getViewBlock()->clickAddToCompare();
        $catalogProductCompare->open();
        $label = $attribute->hasData('manage_frontend_label')
            ? $attribute->getManageFrontendLabel()
            : $attribute->getFrontendLabel();

        \PHPUnit\Framework\Assert::assertTrue(
            in_array($label, $catalogProductCompare->getCompareProductsBlock()->getComparableAttributes()),
            'Attribute is absent on product compare page.'
        );
    }

    public function toString()
    {
        return 'Attribute is present on product compare page.';
    }
}