diff --git a/core/tests/Drupal/Tests/RandomGeneratorTrait.php b/core/tests/Drupal/Tests/RandomGeneratorTrait.php
index b39bd7f29b7b463b5870d2c390a17cf87950a58b..eccac674f1b414f42e79d3a2ea01c8f031c3d7a7 100644
--- a/core/tests/Drupal/Tests/RandomGeneratorTrait.php
+++ b/core/tests/Drupal/Tests/RandomGeneratorTrait.php
@@ -41,8 +41,15 @@ public function randomString($length = 8) {
    *
    * @return bool
    *   TRUE if the random string is valid, FALSE if not.
+   *
+   * @deprecated in drupal:10.2.0 and is removed from drupal:11.0.0.
+   *   Use \Drupal\TestTools\Random::stringValidate() instead.
+   *
+   * @see https://www.drupal.org/node/3358389
    */
   public function randomStringValidate($string) {
+    @trigger_error(__METHOD__ . "() is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Use \Drupal\TestTools\Random::stringValidate() instead. See https://www.drupal.org/node/3358389", E_USER_DEPRECATED);
+
     return Random::stringValidate($string);
   }