ConnectionUnitTest.php

<?php

namespace Drupal\Tests\pgsql\Kernel\pgsql;

use Drupal\KernelTests\Core\Database\DriverSpecificConnectionUnitTestBase;

/**
 * PostgreSQL-specific connection unit tests.
 *
 * @group Database
 */
class ConnectionUnitTest extends DriverSpecificConnectionUnitTestBase {
    
    /**
     * Returns a set of queries specific for PostgreSQL.
     */
    protected function getQuery() : array {
        return [
            'connection_id' => 'SELECT pg_backend_pid()',
            'processlist' => 'SELECT pid FROM pg_stat_activity',
            'show_tables' => 'SELECT * FROM pg_catalog.pg_tables',
        ];
    }

}