Added tests for DTOConverter

tests/Services/InfoProviderSystem/DTOs/PurchaseInfoDTOTest.php

@@ -0,0 +1,34 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 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/>.
+ */
+
+namespace App\Tests\Services\InfoProviderSystem\DTOs;
+
+use App\Services\InfoProviderSystem\DTOs\PurchaseInfoDTO;
+use PHPUnit\Framework\TestCase;
+
+class PurchaseInfoDTOTest extends TestCase
+{
+    public function testThrowOnInvalidType(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->expectExceptionMessage('The prices array must only contain PriceDTO instances');
+        new PurchaseInfoDTO('test', 'test', [new \stdClass()]);
+    }
+}