Unit test for generating slugs

GenerateValidSegmentPath.php

<?php

	namespace My\NamespaceExt\Task;

	use TYPO3\CMS\Core\Charset\CharsetConverter;
	use TYPO3\CMS\Core\Utility\GeneralUtility;

	class GenerateValidSegmentPath {

		/**
		 * @param string $slug
		 *
		 * @return string
		 */
		public function generate(string $string): string {
			return $this->sanitize($string);
		}

		/**
		 * code from: https://github.com/TYPO3/TYPO3.CMS/blob/v9.5.8/typo3/sysext/core/Classes/DataHandling/SlugHelper.php
		 * Cleans a slug value so it is used directly in the path segment of a URL.
		 *
		 * @param string $slug
		 *
		 * @return string
		 */
		private function sanitize(string $slug): string {
			// Convert to lowercase + remove tags
			$slug = mb_strtolower($slug, 'utf-8');
			$slug = strip_tags($slug);
			// Convert some special tokens (space, "_" and "-") to the space character
			$fallbackCharacter = '-';
			$slug = preg_replace('/[ \t\x{00A0}\-+_]+/u', $fallbackCharacter, $slug);
			// Convert extended letters to ascii equivalents
			// The specCharsToASCII() converts "€" to "EUR"
			$slug = GeneralUtility::makeInstance(CharsetConverter::class)
				->specCharsToASCII('utf-8', $slug);
			// Get rid of all invalid characters, but allow slashes
			$slug = preg_replace('/[^\p{L}0-9\/'.preg_quote($fallbackCharacter).']/u', '', $slug);
			// Convert multiple fallback characters to a single one
			if ($fallbackCharacter !== '') {
				$slug = preg_replace('/'.preg_quote($fallbackCharacter).'{2,}/', $fallbackCharacter, $slug);
			}
			// Ensure slug is lower cased after all replacement was done
			$slug = mb_strtolower($slug, 'utf-8');
			// Extract slug, thus it does not have wrapping fallback and slash characters
			$extractedSlug = $this->extract($slug);
			// Remove trailing and beginning slashes, except if the trailing slash was added, then we'll re-add it
			$appendTrailingSlash = $extractedSlug !== '' && substr($slug, -1) === '/';
			$slug = $extractedSlug.($appendTrailingSlash ? '/' : '');
			//if ($this->prependSlashInSlug && ($slug{0} ?? '') !== '/') {
			//	$slug = '/' . $slug;
			//}
			return $slug;
		}

		/**
		 * code from: https://github.com/TYPO3/TYPO3.CMS/blob/v9.5.8/typo3/sysext/core/Classes/DataHandling/SlugHelper.php
		 * Extracts payload of slug and removes wrapping delimiters,
		 * e.g. `/hello/world/` will become `hello/world`.
		 *
		 * @param string $slug
		 *
		 * @return string
		 */
		private function extract(string $slug): string {
			// Convert some special tokens (space, "_" and "-") to the space character
			$fallbackCharacter = '-';

			return trim($slug, $fallbackCharacter.'/');
		}
	}

GenerateValidSegmentPathsTest.php

<?php

	namespace My\NamespaceExt\Tests\Unit\Controller;

	use My\NamespaceExt\Task\GenerateValidSegmentPath;
	use PHPUnit\Framework\TestCase;

	class GenerateValidSegmentPathsTest extends TestCase {

		/**
		 * @var GenerateValidSegmentPath
		 */
		protected $generateValidSegmentPathsSUT;

		protected function setUp() {
			define("TYPO3_OS", "WIN");
			define("PATH_site", "http://my-dev.localhost/");

			parent::setUp();
		}

		public function testExecute() {
			$beraterStack = [
				"Hans Werner",
				"Maraike Schmeißt",
				"Önur Gundalfsson"
			];

			$beraterStackAssertResult = [
				"hans-werner",
				"maraike-schmeisst",
				"oenur-gundalfsson"
			];

			$beraterStackActualResult = [];

			$pathGenerator = new GenerateValidSegmentPath();

			foreach ($beraterStack as $berater) {
				$beraterStackActualResult[] = $pathGenerator->generate($berater);
			}

			$this->assertEquals($beraterStackAssertResult, $beraterStackActualResult);
		}
	}