LonelyMonkeyClass.php

<?php

declare (strict_types=1);
namespace Drupal\error_service_test;

use Drupal\Core\Database\Connection;

/**
 * A class with a single dependency.
 */
class LonelyMonkeyClass {
    
    /**
     * The database connection.
     */
    protected Connection $connection;
    public function __construct(Connection $connection) {
        $this->connection = $connection;
    }

}