InstallerExistingConfigExistingSettingsTest.php

<?php

namespace Drupal\FunctionalTests\Installer;

use Drupal\Core\Database\Database;

/**
 * Verifies that installing from existing configuration works.
 *
 * @group Installer
 */
class InstallerExistingConfigExistingSettingsTest extends InstallerExistingConfigTest {
    
    /**
     * {@inheritdoc}
     *
     * Partially configures a preexisting settings.php file before invoking the
     * interactive installer.
     */
    protected function prepareEnvironment() {
        parent::prepareEnvironment();
        // Pre-configure hash salt.
        // Any string is valid, so simply use the class name of this test.
        $this->settings['settings']['hash_salt'] = (object) [
            'value' => __CLASS__,
            'required' => TRUE,
        ];
        // Pre-configure database credentials.
        $connection_info = Database::getConnectionInfo();
        unset($connection_info['default']['pdo']);
        unset($connection_info['default']['init_commands']);
        $this->settings['databases']['default'] = (object) [
            'value' => $connection_info,
            'required' => TRUE,
        ];
    }

}