Added additional tests

tests/Services/Cache/ElementCacheTagGeneratorTest.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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/>.
+ */
+
+namespace App\Tests\Services\Cache;
+
+use App\Entity\Parts\Part;
+use App\Services\Cache\ElementCacheTagGenerator;
+use PHPUnit\Framework\TestCase;
+
+final class ElementCacheTagGeneratorTest extends TestCase
+{
+    private ElementCacheTagGenerator $service;
+
+    protected function setUp(): void
+    {
+        $this->service = new ElementCacheTagGenerator();
+    }
+
+    public function testClassNameIsConvertedToTag(): void
+    {
+        $tag = $this->service->getElementTypeCacheTag(Part::class);
+        // Backslashes must be replaced by underscores
+        $this->assertStringNotContainsString('\\', $tag);
+        $this->assertSame(str_replace('\\', '_', Part::class), $tag);
+    }
+
+    public function testObjectInputGivesSameResultAsClassName(): void
+    {
+        $part = new Part();
+        $tagFromObject = $this->service->getElementTypeCacheTag($part);
+        $tagFromClass = $this->service->getElementTypeCacheTag(Part::class);
+        $this->assertSame($tagFromClass, $tagFromObject);
+    }
+
+    public function testResultIsCached(): void
+    {
+        $tag1 = $this->service->getElementTypeCacheTag(Part::class);
+        $tag2 = $this->service->getElementTypeCacheTag(Part::class);
+        $this->assertSame($tag1, $tag2);
+    }
+
+    public function testNonExistentClassThrowsException(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        $this->service->getElementTypeCacheTag('App\\NonExistent\\Foo');
+    }
+}