AssertCacheIsRefreshableAndInvalidated.php

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

use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\PageCache\Test\Page\Adminhtml\AdminCache;

class AssertCacheIsRefreshableAndInvalidated extends AbstractConstraint
{
    const SUCCESS_MESSAGE = '%d cache type(s) refreshed.';

    public function processAssert(AdminCache $adminCache, $cacheTags)
    {
        $items = [];
        foreach ($cacheTags as $cacheTag) {
            $items[] = [
                'tags' => $cacheTag,
                'status' => 'Invalidated'
            ];
        }

        $adminCache->open();
        $adminCache->getGridBlock()->massaction($items, 'Refresh');

        \PHPUnit\Framework\Assert::assertEquals(
            sprintf(self::SUCCESS_MESSAGE, count($items)),
            $adminCache->getMessagesBlock()->getSuccessMessage(),
            'Cache is Invalid and refreshable.'
        );
    }

    public function toString()
    {
        return 'Cache is not Invalid or not refreshable.';
    }
}