Update QueryBuilderTest.php

tests/Doctrine/Tests/DBAL/Query/QueryBuilderTest.php

@@ -4,6 +4,7 @@ namespace Doctrine\Tests\DBAL\Query;
 
 use Doctrine\DBAL\Query\Expression\ExpressionBuilder;
 use Doctrine\DBAL\Query\QueryBuilder;
+use Doctrine\DBAL\Query\QueryException;
 
 /**
  * @group DBAL-12