class ConfigExportStorageTest

class ConfigExportStorageTest extends KernelTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'system',
        'config_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installConfig([
            'system',
            'config_test',
        ]);
    }
    
    /**
     * Tests configuration override.
     */
    public function testExportStorage() {
        
        /** @var \Drupal\Core\Config\StorageInterface $active */
        $active = $this->container
            ->get('config.storage');
        
        /** @var \Drupal\Core\Config\StorageInterface $export */
        $export = $this->container
            ->get('config.storage.export');
        // Test that the active and the export storage contain the same config.
        $this->assertNotEmpty($active->listAll());
        $this->assertEquals($active->listAll(), $export->listAll());
        foreach ($active->listAll() as $name) {
            $this->assertEquals($active->read($name), $export->read($name));
        }
        // Test that the export storage is read-only.
        $this->expectException(\BadMethodCallException::class);
        $export->deleteAll();
    }

}