AssertProductCompareItemsLink.php

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

use Magento\Cms\Test\Page\CmsIndex;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertProductCompareItemsLink extends AbstractConstraint
{
    public function processAssert(array $products, CmsIndex $cmsIndex)
    {
        $productQty = count($products);
        $qtyOnPage = $cmsIndex->getCompareLinkBlock()->getQtyInCompareList();

        \PHPUnit\Framework\Assert::assertEquals(
            $productQty,
            $qtyOnPage,
            'Qty is not correct in "Compare Products" link.'
        );

        $compareProductUrl = '/catalog/product_compare/';
        \PHPUnit\Framework\Assert::assertTrue(
            strpos($cmsIndex->getLinksBlock()->getLinkUrl('Compare Products'), $compareProductUrl) !== false,
            'Compare product link isn\'t lead to Compare Product Page.'
        );
    }

    public function toString()
    {
        return '"Compare Products..." link on top menu of page is correct.';
    }
}