Issue #3488863 by claudiu.cristea, alorenc: An unpredictable pipeline failure

tests/src/Traits/PrivateMessageTestTrait.php

@@ -30,13 +30,16 @@ trait PrivateMessageTestTrait {
    */
   protected function createTestingUsers(int $amount = 2): void {
     $keys = array_map(fn(int $i): string => chr($i + 96), range(1, $amount));
+    $randomGenerator = $this->getRandomGenerator();
 
     foreach ($keys as $key) {
+      $firstName = ucfirst($randomGenerator->word(rand(5, 9)));
+      $lastName = ucfirst($randomGenerator->word(rand(5, 9)));
       $values = FieldConfig::loadByName(
         'user',
         'user',
         'full_name'
-      ) ? ['full_name' => $this->randomString()] : [];
+      ) ? ['full_name' => "$firstName $lastName"] : [];
 
       $this->users[$key] = $this->createUser([
         'use private messaging system',