NullBackendTest.php

<?php

namespace Drupal\Tests\Core\Cache;

use Drupal\Core\Cache\NullBackend;
use Drupal\Tests\UnitTestCase;

/**
 * Tests the cache NullBackend.
 *
 * @group Cache
 */
class NullBackendTest extends UnitTestCase {
    
    /**
     * Tests that the NullBackend does not actually store variables.
     */
    public function testNullBackend() {
        $null_cache = new NullBackend('test');
        $key = $this->randomMachineName();
        $value = $this->randomMachineName();
        $null_cache->set($key, $value);
        $this->assertFalse($null_cache->get($key));
    }

}