diff --git a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
index 1b746e6..f01019f 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
@@ -1185,13 +1185,14 @@ protected function settingsSet($name, $value) {
    * @see Drupal\simpletest\TestBase::randomName()
    */
   public function randomString($length = 8) {
-    do {
-      $str = '';
-      for ($i = 0; $i < $length; $i++) {
-        $str .= chr(mt_rand(32, 126));
-      }
-    } while (isset($this->randomStrings[$str]));
-    return $str;
+//    do {
+//      $str = '';
+//      for ($i = 0; $i < $length; $i++) {
+//        $str .= chr(mt_rand(32, 126));
+//      }
+//    } while (isset($this->randomStrings[$str]));
+//    return $str;
+    return str_repeat('a', $length);
   }
 
   /**
@@ -1215,15 +1216,16 @@ public function randomString($length = 8) {
    * @see Drupal\simpletest\TestBase::randomString()
    */
   public function randomName($length = 8) {
-    do {
-      $values = array_merge(range(65, 90), range(97, 122), range(48, 57));
-      $max = count($values) - 1;
-      $str = chr(mt_rand(97, 122));
-      for ($i = 1; $i < $length; $i++) {
-        $str .= chr($values[mt_rand(0, $max)]);
-      }
-    } while (isset($this->randomNames[$str]));
-    return $str;
+//    do {
+//      $values = array_merge(range(65, 90), range(97, 122), range(48, 57));
+//      $max = count($values) - 1;
+//      $str = chr(mt_rand(97, 122));
+//      for ($i = 1; $i < $length; $i++) {
+//        $str .= chr($values[mt_rand(0, $max)]);
+//      }
+//    } while (isset($this->randomNames[$str]));
+//    return $str;
+    return str_repeat('a', $length);
   }
 
   /**