DrupalFlushAllCachesTest.php

<?php

namespace Drupal\KernelTests\Core\Common;

use Drupal\KernelTests\KernelTestBase;

/**
 * @covers ::drupal_flush_all_caches
 * @group Common
 */
class DrupalFlushAllCachesTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
    ];
    
    /**
     * Tests that drupal_flush_all_caches() uses core.extension properly.
     */
    public function testDrupalFlushAllCachesModuleList() {
        $core_extension = \Drupal::configFactory()->getEditable('core.extension');
        $module = $core_extension->get('module');
        $module['system_test'] = -10;
        $core_extension->set('module', module_config_sort($module))
            ->save();
        drupal_flush_all_caches();
        $this->assertSame([
            'system_test',
            'path_alias',
            'system',
        ], array_keys($this->container
            ->getParameter('container.modules')));
    }

}