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diff --git a/tests/src/Util/StringsTest.php b/tests/src/Util/StringsTest.php
index eb5e707a70..ae17920e04 100644
--- a/tests/src/Util/StringsTest.php
+++ b/tests/src/Util/StringsTest.php
@@ -1,49 +1,217 @@
 <?php
 /**
- * @file tests/src/Util/StringsTest.php
+ * @copyright Copyright (C) 2010-2023, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * 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 Friendica\Test\Util;
+
+namespace Friendica\Test\src\Util;
 
 use Friendica\Util\Strings;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @brief Strings utility test class
+ * Strings utility test class
  */
 class StringsTest extends TestCase
 {
-    /**
-	* escape and unescape
-	*/
-	public function testEscapeUnescape()
-	{
-		$text="<tag>I want to break\n this!11!<?hard?></tag>";
-		$xml=XML::escape($text);
-		$retext=XML::unescape($text);
-		$this->assertEquals($text, $retext);
-    }
-    
-	/**
-	 * escape and put in a document
-	 */
-	public function testEscapeDocument()
-	{
-		$tag="<tag>I want to break</tag>";
-		$xml=XML::escape($tag);
-		$text='<text>'.$xml.'</text>';
-		$xml_parser=xml_parser_create();
-		//should be possible to parse it
-		$values=array();
-		$index=array();
-		$this->assertEquals(1, xml_parse_into_struct($xml_parser, $text, $values, $index));
-		$this->assertEquals(
-			array('TEXT'=>array(0)),
-			$index
+	/**
+	 * randomnames should be random, even length
+	 */
+	public function testRandomEven()
+	{
+		$randomname1 = Strings::getRandomName(10);
+		$randomname2 = Strings::getRandomName(10);
+
+		self::assertNotEquals($randomname1, $randomname2);
+	}
+
+	/**
+	 * randomnames should be random, odd length
+	 */
+	public function testRandomOdd()
+	{
+		$randomname1 = Strings::getRandomName(9);
+		$randomname2 = Strings::getRandomName(9);
+
+		self::assertNotEquals($randomname1, $randomname2);
+	}
+
+	/**
+	 * try to fail ramdonnames
+	 */
+	public function testRandomNameNoLength()
+	{
+		$randomname1 = Strings::getRandomName(0);
+		self::assertEquals(0, strlen($randomname1));
+	}
+
+	/**
+	 * try to fail it with invalid input
+	 *
+	 * @todo What's corect behaviour here? An exception?
+	 */
+	public function testRandomNameNegativeLength()
+	{
+		$randomname1 = Strings::getRandomName(-23);
+		self::assertEquals(0, strlen($randomname1));
+	}
+
+	/**
+	 * test with a length, that may be too short
+	 */
+	public function testRandomNameLength1()
+	{
+		$randomname1 = Strings::getRandomName(1);
+		self::assertEquals(1, strlen($randomname1));
+
+		$randomname2 = Strings::getRandomName(1);
+		self::assertEquals(1, strlen($randomname2));
+	}
+
+	/**
+	 * test, that tags are escaped
+	 */
+	public function testEscapeHtml()
+	{
+		$invalidstring='<submit type="button" onclick="alert(\'failed!\');" />';
+
+		$escapedString = Strings::escapeHtml($invalidstring);
+
+		self::assertEquals(
+			"&lt;submit type=&quot;button&quot; onclick=&quot;alert('failed!');&quot; /&gt;",
+			$escapedString
 		);
-		$this->assertEquals(
-			array(array('tag'=>'TEXT', 'type'=>'complete', 'level'=>1, 'value'=>$tag)),
-			$values
+	}
+
+	public function dataIsHex()
+	{
+		return [
+			'validHex' => [
+				'input' => '90913473615bf00c122ac78338492980',
+				'valid' => true,
+			],
+			'invalidHex' => [
+				'input' => '90913473615bf00c122ac7833849293',
+				'valid' => false,
+			],
+			'emptyHex' => [
+				'input' => '',
+				'valid' => false,
+			],
+		];
+	}
+
+	/**
+	 * Tests if the string is a valid hexadecimal value
+	 *
+	 * @param string $input Input string
+	 * @param bool   $valid Whether testing on valid or invalid
+	 *
+	 * @dataProvider dataIsHex
+	 */
+	public function testIsHex(string $input, bool $valid = false)
+	{
+		self::assertEquals($valid, Strings::isHex($input));
+	}
+
+	/**
+	 * Tests that Strings::substringReplace behaves the same as substr_replace with ASCII strings in all the possible
+	 * numerical parameter configurations (positive, negative, zero, out of bounds either side, null)
+	 */
+	public function testSubstringReplaceASCII()
+	{
+		for ($start = -10; $start <= 10; $start += 5) {
+			self::assertEquals(
+				substr_replace('string', 'replacement', $start),
+				Strings::substringReplace('string', 'replacement', $start)
+			);
+
+			for ($length = -10; $length <= 10; $length += 5) {
+				self::assertEquals(
+					substr_replace('string', 'replacement', $start, $length),
+					Strings::substringReplace('string', 'replacement', $start, $length)
+				);
+			}
+		}
+	}
+
+
+	public function dataSubstringReplaceMultiByte()
+	{
+		return [
+			'issue-8470' => [
+				'expected' => 'Je n’y pense que maintenant (pask ma sonnette ne fonctionne pas) : mettre un gentil mot avec mes coordonnées sur ma porte est le moyen le plus simple de rester en contact si besoin avec mon voisinage direct ! [url=https://www.instagram.com/p/B-UdH2loee1/?igshid=x4aglyju9kva]instagram.com/p/B-UdH2loee1/…[/url] [rest of the post]',
+				'string' => 'Je n’y pense que maintenant (pask ma sonnette ne fonctionne pas) : mettre un gentil mot avec mes coordonnées sur ma porte est le moyen le plus simple de rester en contact si besoin avec mon voisinage direct ! https://t.co/YoBWTHsAAk [rest of the post]',
+				'replacement' => '[url=https://www.instagram.com/p/B-UdH2loee1/?igshid=x4aglyju9kva]instagram.com/p/B-UdH2loee1/…[/url]',
+				'start' => 209,
+				'length' => 23,
+			],
+		];
+	}
+
+	/**
+	 * Tests cases where Strings::substringReplace is needed over substr_replace with multi-byte strings and character
+	 * offsets
+	 *
+	 * @param string   $expected
+	 * @param string   $string
+	 * @param string   $replacement
+	 * @param int      $start
+	 * @param int|null $length
+	 *
+	 * @dataProvider dataSubstringReplaceMultiByte
+	 */
+	public function testSubstringReplaceMultiByte(string $expected, string $string, string $replacement, int $start, int $length = null)
+	{
+		self::assertEquals(
+			$expected,
+			Strings::substringReplace(
+				$string,
+				$replacement,
+				$start,
+				$length
+			)
 		);
-		xml_parser_free($xml_parser);
+	}
+
+	public function testPerformWithEscapedBlocks()
+	{
+		$originalText = '[noparse][/noparse][nobb]nobb[/nobb][noparse]noparse[/noparse]';
+
+		$text = Strings::performWithEscapedBlocks($originalText, '#[(?:noparse|nobb)].*?\[/(?:noparse|nobb)]#is', function ($text) {
+			return $text;
+		});
+
+		self::assertEquals($originalText, $text);
+	}
+
+	public function testPerformWithEscapedBlocksNested()
+	{
+		$originalText = '[noparse][/noparse][nobb]nobb[/nobb][noparse]noparse[/noparse]';
+
+		$text = Strings::performWithEscapedBlocks($originalText, '#[nobb].*?\[/nobb]#is', function ($text) {
+			$text = Strings::performWithEscapedBlocks($text, '#[noparse].*?\[/noparse]#is', function ($text) {
+				return $text;
+			});
+
+			return $text;
+		});
+
+		self::assertEquals($originalText, $text);
 	}
 }