AssertProductCompareRemoveLastProductMessage.php

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

use Magento\Catalog\Test\Page\Product\CatalogProductCompare;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertProductCompareRemoveLastProductMessage extends AbstractConstraint
{
    const SUCCESS_MESSAGE = 'You have no items to compare.';

    public function processAssert(CatalogProductCompare $comparePage)
    {
        $comparePage->open();
        $actualMessage = $comparePage->getCompareProductsBlock()->getEmptyMessage();
        \PHPUnit\Framework\Assert::assertEquals(
            self::SUCCESS_MESSAGE,
            $actualMessage,
            'Wrong success message is displayed.'
            . "\nExpected: " . self::SUCCESS_MESSAGE
            . "\nActual: " . $actualMessage
        );
    }

    public function toString()
    {
        return 'After removing last product the message appears on "Compare Products" page.';
    }
}