IntegrityTest.php

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

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', $registeredSingletons);
        $this->assertTrue($registeredSingletons['TYPO3\\CMS\\Core\\Cache\\CacheManager'] instanceof \TYPO3\CMS\Core\Cache\CacheManager);
    }
}