/**
  * Gets the random data generator.
  *
  * @return \Drupal\Component\Utility\Random
  */
 protected static function getRandom()
 {
     if (!static::$random) {
         static::$random = new Random();
     }
     return static::$random;
 }
 public static function setUpBeforeClass()
 {
     // each test case has a different random, avoid false positive
     static::$random = rand();
 }