Added label placeholders to add a barcode version of the IPN to a label

This fixes issue #373

tests/Services/LabelSystem/Barcodes/BarcodeHelperTest.php

@@ -0,0 +1,68 @@
+<?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\LabelSystem\Barcodes;
+
+use App\Entity\LabelSystem\BarcodeType;
+use App\Services\LabelSystem\Barcodes\BarcodeHelper;
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+
+class BarcodeHelperTest extends WebTestCase
+{
+
+    protected ?BarcodeHelper $service = null;
+
+    protected function setUp(): void
+    {
+        self::bootKernel();
+        $this->service = self::getContainer()->get(BarcodeHelper::class);
+    }
+
+    public function testBarcodeAsHTML(): void
+    {
+        $html = $this->service->barcodeAsHTML('Test', BarcodeType::QR);
+        $this->assertStringStartsWith('<img', $html);
+        $this->assertStringContainsString('alt="Test"', $html);
+    }
+
+    public function testBarcodeAsSVG(): void
+    {
+        //Test that all barcodes types are supported
+        foreach (BarcodeType::cases() as $type) {
+            //Skip NONE type
+            if (BarcodeType::NONE === $type) {
+                continue;
+            }
+
+            $svg = $this->service->barcodeAsSVG('1234', $type);
+
+            $this->assertStringContainsStringIgnoringCase('SVG', $svg);
+        }
+    }
+
+    public function testBarcodeAsSVGNoneType(): void
+    {
+        //On NONE type, service must throw an exception.
+        $this->expectException(\InvalidArgumentException::class);
+
+        $this->service->barcodeAsSVG('test', BarcodeType::NONE);
+    }
+}