ConfigTestStorage.php

<?php

namespace Drupal\config_test;

use Drupal\Core\Config\Entity\ConfigEntityStorage;
use Drupal\Core\Config\Config;
class ConfigTestStorage extends ConfigEntityStorage {
    
    /**
     * {@inheritdoc}
     */
    public function importCreate($name, Config $new_config, Config $old_config) {
        // Set a global value we can check in test code.
        $GLOBALS['hook_config_import'] = __METHOD__;
        return parent::importCreate($name, $new_config, $old_config);
    }
    
    /**
     * {@inheritdoc}
     */
    public function importUpdate($name, Config $new_config, Config $old_config) {
        // Set a global value we can check in test code.
        $GLOBALS['hook_config_import'] = __METHOD__;
        return parent::importUpdate($name, $new_config, $old_config);
    }
    
    /**
     * {@inheritdoc}
     */
    public function importDelete($name, Config $new_config, Config $old_config) {
        // Set a global value we can check in test code.
        $GLOBALS['hook_config_import'] = __METHOD__;
        return parent::importDelete($name, $new_config, $old_config);
    }

}