Add Helper class with random username generator method

tests/Helper.php

@@ -0,0 +1,26 @@
+<?php
+
+    class Helper
+    {
+        /**
+         * Generates a random username based on the given domain.
+         *
+         * @param string $domain The domain to be appended to the generated username.
+         * @param int $length The length of the random string.
+         * @param string $prefix The prefix to be appended to the generated username.
+         * @return string Returns a randomly generated username in the format 'user<randomString>@<domain>'.
+         */
+        public static function generateRandomPeer(string $domain, int $length=16, string $prefix='userTest'): string
+        {
+            $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+            $charactersLength = strlen($characters);
+            $randomString = '';
+
+            for ($i = 0; $i < $length; $i++)
+            {
+                $randomString .= $characters[rand(0, $charactersLength - 1)];
+            }
+
+            return sprintf('%s%s@%s', $prefix, $randomString, $domain);
+        }
+    }