Added tests for custom doctrine functions

tests/Doctrine/Functions/Field2Test.php

@@ -0,0 +1,45 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2026 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace App\Tests\Doctrine\Functions;
+
+use App\Doctrine\Functions\Field2;
+use Doctrine\DBAL\Platforms\MySQLPlatform;
+
+final class Field2Test extends AbstractDoctrineFunctionTestCase
+{
+    public function testField2BuildsSql(): void
+    {
+        $function = new Field2('FIELD2');
+        $this->setObjectProperty($function, 'field', $this->createNode('p.id'));
+        $this->setObjectProperty($function, 'values', [
+            $this->createNode('1'),
+            $this->createNode('2'),
+            $this->createNode('3'),
+        ]);
+
+        $sql = $function->getSql($this->createSqlWalker(new MySQLPlatform()));
+
+        $this->assertSame('FIELD2(p.id, 1, 2, 3)', $sql);
+    }
+}
+