Inital commit after splitting vom main project

tests/SlugifyTest.php

@@ -0,0 +1,81 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tez\Utils\Tests\Str;
+
+use PHPUnit\Framework\TestCase;
+use Tez\Utils\Str\Slugify;
+
+final class SlugifyTest extends TestCase
+{
+    public function testBasicSlug(): void
+    {
+        self::assertSame('hello-world', Slugify::slug('Hello World'));
+    }
+
+    public function testGermanUmlauts(): void
+    {
+        self::assertSame('aerger-mit-umlauten', Slugify::slug('Ärger mit Umlauten!'));
+    }
+
+    public function testGermanSharpS(): void
+    {
+        self::assertSame('strasse', Slugify::slug('Straße'));
+    }
+
+    public function testFrenchAccents(): void
+    {
+        self::assertSame('creme-brulee', Slugify::slug('Crème brûlée'));
+    }
+
+    public function testMultipleSpacesCollapsed(): void
+    {
+        self::assertSame('multiple-spaces', Slugify::slug('  Multiple   Spaces  '));
+    }
+
+    public function testCustomSeparator(): void
+    {
+        self::assertSame('hello_world', Slugify::slug('Hello World', '_'));
+    }
+
+    public function testSpecialCharactersReplaced(): void
+    {
+        self::assertSame('foo-bar-baz', Slugify::slug('foo/bar::baz'));
+    }
+
+    public function testLeadingAndTrailingSeparatorsRemoved(): void
+    {
+        self::assertSame('hello', Slugify::slug('---hello---'));
+    }
+
+    public function testEmptyStringReturnsEmpty(): void
+    {
+        self::assertSame('', Slugify::slug(''));
+    }
+
+    public function testBlankStringReturnsEmpty(): void
+    {
+        self::assertSame('', Slugify::slug('   '));
+    }
+
+    public function testNordicCharacters(): void
+    {
+        self::assertSame('ae-o', Slugify::slug('Æ Ø'));
+    }
+
+    public function testSpanishN(): void
+    {
+        self::assertSame('canon', Slugify::slug('Cañon'));
+    }
+
+    public function testAlreadyValidSlugUnchanged(): void
+    {
+        self::assertSame('hello-world-123', Slugify::slug('hello-world-123'));
+    }
+
+    public function testNumbersPreserved(): void
+    {
+        self::assertSame('php-8-3', Slugify::slug('PHP 8.3'));
+    }
+}