diff --git a/composer.json b/composer.json
index 706ee3f0e4..12df630ccf 100644
--- a/composer.json
+++ b/composer.json
@@ -157,6 +157,7 @@
 	},
 	"scripts": {
 		"test": "phpunit",
+		"test:unit": "phpunit -c tests/phpunit.xml --testsuite unit",
 		"phpstan": "phpstan analyze --memory-limit 1024M --configuration .phpstan.neon",
 		"lint": "find . -name \\*.php -not -path './vendor/*' -not -path './view/asset/*' -print0 | xargs -0 -n1 php -l",
 		"docker:translate": "docker run --rm -v $PWD:/data -w /data friendicaci/transifex bin/run_xgettext.sh",
diff --git a/src/Util/Crypto.php b/src/Util/Crypto.php
index ba3c46bbc3..8113697639 100644
--- a/src/Util/Crypto.php
+++ b/src/Util/Crypto.php
@@ -306,13 +306,6 @@ class Crypto
 	 */
 	public static function randomDigits($digits)
 	{
-		$rn = '';
-
-		// generating cryptographically secure pseudo-random integers
-		for ($i = 0; $i < $digits; $i++) {
-			$rn .= random_int(0, 9);
-		}
-
-		return (int) $rn;
+		return random_int(0, 10 ** $digits - 1);
 	}
 }
diff --git a/tests/Unit/Util/CryptoTest.php b/tests/Unit/Util/CryptoTest.php
new file mode 100644
index 0000000000..1e728746f2
--- /dev/null
+++ b/tests/Unit/Util/CryptoTest.php
@@ -0,0 +1,45 @@
+<?php
+
+// Copyright (C) 2010-2024, the Friendica project
+// SPDX-FileCopyrightText: 2010-2024 the Friendica project
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+namespace Friendica\Test\Unit\Util;
+
+use Friendica\Util\Crypto;
+use phpmock\phpunit\PHPMock;
+use PHPUnit\Framework\TestCase;
+
+class CryptoTest extends TestCase
+{
+	use PHPMock;
+
+	public function testRandomDigitsRandomInt()
+	{
+		$random_int = $this->getFunctionMock('Friendica\Util', 'random_int');
+		$random_int->expects($this->any())->willReturnCallback(function ($min, $max) {
+			return 12345678;
+		});
+
+		self::assertSame(12345678, Crypto::randomDigits(8));
+	}
+
+	public function testDiasporaPubRsaToMe()
+	{
+		$key = 'LS0tLS1CRUdJTiBSU0EgUFVCTElDIEtFWS0tLS0tDQpNSUdKQW9HQkFORjVLTmJzN2k3aTByNVFZckNpRExEZ09pU1BWbmgvdlFnMXpnSk9VZVRheWVETk5yZTR6T1RVDQpSVDcyZGlLQ294OGpYOE5paElJTFJtcUtTOWxVYVNzd21QcVNFenVpdE5xeEhnQy8xS2ZuaXM1Qm96NnRwUUxjDQpsZDMwQjJSMWZIVWdFTHZWd0JkV29pRDhSRUt1dFNuRVBGd1RwVmV6aVlWYWtNY25pclRWQWdNQkFBRT0NCi0tLS0tRU5EIFJTQSBQVUJMSUMgS0VZLS0tLS0';
+
+		// TODO PHPUnit 10: Replace with assertStringEqualsStringIgnoringLineEndings()
+		self::assertSame(
+			str_replace("\n", "\r\n", <<< TXT
+			-----BEGIN PUBLIC KEY-----
+			MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDReSjW7O4u4tK+UGKwogyw4Dok
+			j1Z4f70INc4CTlHk2sngzTa3uMzk1EU+9nYigqMfI1/DYoSCC0ZqikvZVGkrMJj6
+			khM7orTasR4Av9Sn54rOQaM+raUC3JXd9AdkdXx1IBC71cAXVqIg/ERCrrUpxDxc
+			E6VXs4mFWpDHJ4q01QIDAQAB
+			-----END PUBLIC KEY-----
+			TXT),
+			Crypto::rsaToPem(base64_decode($key))
+		);
+	}
+}
diff --git a/tests/datasets/crypto/rsa/diaspora-public-pem b/tests/datasets/crypto/rsa/diaspora-public-pem
deleted file mode 100644
index 09dd1640d3..0000000000
--- a/tests/datasets/crypto/rsa/diaspora-public-pem
+++ /dev/null
@@ -1,6 +0,0 @@
------BEGIN PUBLIC KEY-----
-MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDReSjW7O4u4tK+UGKwogyw4Dok
-j1Z4f70INc4CTlHk2sngzTa3uMzk1EU+9nYigqMfI1/DYoSCC0ZqikvZVGkrMJj6
-khM7orTasR4Av9Sn54rOQaM+raUC3JXd9AdkdXx1IBC71cAXVqIg/ERCrrUpxDxc
-E6VXs4mFWpDHJ4q01QIDAQAB
------END PUBLIC KEY-----
\ No newline at end of file
diff --git a/tests/datasets/crypto/rsa/diaspora-public-rsa-base64 b/tests/datasets/crypto/rsa/diaspora-public-rsa-base64
deleted file mode 100644
index ba835a4711..0000000000
--- a/tests/datasets/crypto/rsa/diaspora-public-rsa-base64
+++ /dev/null
@@ -1 +0,0 @@
-LS0tLS1CRUdJTiBSU0EgUFVCTElDIEtFWS0tLS0tDQpNSUdKQW9HQkFORjVLTmJzN2k3aTByNVFZckNpRExEZ09pU1BWbmgvdlFnMXpnSk9VZVRheWVETk5yZTR6T1RVDQpSVDcyZGlLQ294OGpYOE5paElJTFJtcUtTOWxVYVNzd21QcVNFenVpdE5xeEhnQy8xS2ZuaXM1Qm96NnRwUUxjDQpsZDMwQjJSMWZIVWdFTHZWd0JkV29pRDhSRUt1dFNuRVBGd1RwVmV6aVlWYWtNY25pclRWQWdNQkFBRT0NCi0tLS0tRU5EIFJTQSBQVUJMSUMgS0VZLS0tLS0
\ No newline at end of file
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 6f16c7a73e..0e323813f8 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -7,10 +7,16 @@
 		timeoutForMediumTests="900"
 		timeoutForLargeTests="900"
 		xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
-	<testsuite name="friendica">
-		<directory suffix=".php">functional/</directory>
-		<directory suffix=".php">src/</directory>
-	</testsuite>
+	<testsuites>
+		<testsuite name="friendica">
+			<directory suffix=".php">functional/</directory>
+			<directory suffix=".php">src/</directory>
+			<directory suffix=".php">Unit/</directory>
+		</testsuite>
+		<testsuite name="unit">
+			<directory suffix=".php">Unit/</directory>
+		</testsuite>
+	</testsuites>
 	<!-- Filters for Code Coverage -->
 	<coverage>
 		<include>
diff --git a/tests/src/Util/CryptoTest.php b/tests/src/Util/CryptoTest.php
deleted file mode 100644
index 544561bc3b..0000000000
--- a/tests/src/Util/CryptoTest.php
+++ /dev/null
@@ -1,65 +0,0 @@
-<?php
-
-// Copyright (C) 2010-2024, the Friendica project
-// SPDX-FileCopyrightText: 2010-2024 the Friendica project
-//
-// SPDX-License-Identifier: AGPL-3.0-or-later
-
-namespace Friendica\Test\src\Util;
-
-use Friendica\Util\Crypto;
-use phpmock\phpunit\PHPMock;
-use PHPUnit\Framework\TestCase;
-
-class CryptoTest extends TestCase
-{
-	use PHPMock;
-
-	public static function tearDownAfterClass(): void
-	{
-		// Reset mocking
-		global $phpMock;
-		$phpMock = [];
-
-		parent::tearDownAfterClass();
-	}
-
-	public function testRandomDigitsRandomInt()
-	{
-		$random_int = $this->getFunctionMock('Friendica\Util', 'random_int');
-		$random_int->expects($this->any())->willReturnCallback(function($min, $max) {
-			return 1;
-		});
-
-		self::assertSame(1, Crypto::randomDigits(1));
-		self::assertSame(11111111, Crypto::randomDigits(8));
-	}
-
-	public function dataRsa(): array
-	{
-		return [
-			'diaspora' => [
-				'key' => file_get_contents(__DIR__ . '/../../datasets/crypto/rsa/diaspora-public-rsa-base64'),
-				'expected' => file_get_contents(__DIR__ . '/../../datasets/crypto/rsa/diaspora-public-pem'),
-			],
-		];
-	}
-
-	/**
-	 * @dataProvider dataRsa
-	 */
-	public function testPubRsaToMe(string $key, string $expected)
-	{
-		self::assertSame($expected, Crypto::rsaToPem(base64_decode($key)));
-	}
-
-
-	public function dataPEM()
-	{
-		return [
-			'diaspora' => [
-				'key' => file_get_contents(__DIR__ . '/../../datasets/crypto/rsa/diaspora-public-pem'),
-			],
-		];
-	}
-}