ConfigOverrider.php

<?php

namespace Drupal\config_override_test;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Config\ConfigFactoryOverrideInterface;
use Drupal\Core\Config\StorageInterface;

/**
 * Tests module overrides for configuration.
 */
class ConfigOverrider implements ConfigFactoryOverrideInterface {
    
    /**
     * {@inheritdoc}
     */
    public function loadOverrides($names) {
        $overrides = [];
        if (!empty($GLOBALS['config_test_run_module_overrides'])) {
            if (in_array('system.site', $names)) {
                $overrides = $overrides + [
                    'system.site' => [
                        'name' => 'ZOMG overridden site name',
                    ],
                ];
            }
            if (in_array('config_override_test.new', $names)) {
                $overrides = $overrides + [
                    'config_override_test.new' => [
                        'module' => 'override',
                    ],
                ];
            }
        }
        return $overrides;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheSuffix() {
        return 'ConfigOverrider';
    }
    
    /**
     * {@inheritdoc}
     */
    public function createConfigObject($name, $collection = StorageInterface::DEFAULT_COLLECTION) {
        return NULL;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheableMetadata($name) {
        return new CacheableMetadata();
    }

}