IntegrityTest.php

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<?php
namespace TYPO3\CMS\Core\Tests\Integrity;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class IntegrityTest extends \TYPO3\CMS\Core\Tests\UnitTestCase
{
    public function standardSingletonIsRegistered()
    {
        $registeredSingletons = \TYPO3\CMS\Core\Utility\GeneralUtility::getSingletonInstances();
        $this->assertArrayHasKey(\TYPO3\CMS\Core\Cache\CacheManager::class, $registeredSingletons);
        $this->assertTrue($registeredSingletons[\TYPO3\CMS\Core\Cache\CacheManager::class] instanceof \TYPO3\CMS\Core\Cache\CacheManager);
    }
}