diff --git a/mailcow/src/mailcow-dockerized/data/web/inc/lib/vendor/robthree/twofactorauth/tests/Providers/Rng/MCryptRNGProviderTest.php b/mailcow/src/mailcow-dockerized/data/web/inc/lib/vendor/robthree/twofactorauth/tests/Providers/Rng/MCryptRNGProviderTest.php
new file mode 100644
index 0000000..f6dd91e
--- /dev/null
+++ b/mailcow/src/mailcow-dockerized/data/web/inc/lib/vendor/robthree/twofactorauth/tests/Providers/Rng/MCryptRNGProviderTest.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace Tests\Providers\Rng;
+
+use PHPUnit\Framework\TestCase;
+use Tests\MightNotMakeAssertions;
+use RobThree\Auth\Providers\Rng\MCryptRNGProvider;
+
+class MCryptRNGProviderTest extends TestCase
+{
+    use NeedsRngLengths, MightNotMakeAssertions;
+
+    /**
+     * @requires function mcrypt_create_iv
+     *
+     * @return void
+     */
+    public function testMCryptRNGProvidersReturnExpectedNumberOfBytes()
+    {
+        if (function_exists('mcrypt_create_iv')) {
+            $rng = new MCryptRNGProvider();
+
+            foreach ($this->rngTestLengths as $l) {
+                $this->assertEquals($l, strlen($rng->getRandomBytes($l)));
+            }
+
+            $this->assertTrue($rng->isCryptographicallySecure());
+        } else {
+            $this->noAssertionsMade();
+        }
+    }
+}