StubUpsert.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\Core\Database\Stub;

use Drupal\Core\Database\Query\Upsert;

/**
 * A stub of core Upsert for testing purposes.
 */
class StubUpsert extends Upsert {
  
  /**
   * {@inheritdoc}
   */
  public function __toString() {
    throw new \BadMethodCallException('Upsert not implemented');
  }

}