Gc\Registry::unsetInstance PHP Méthode

    public static function unsetInstance()
    {
        self::$registry = null;
    }

 /**
  * Test
  *
  * @return void
  */
 public function testIsRegisteredWithoutData()
 {
     $this->object->unsetInstance();
     $this->assertFalse($this->object->isRegistered('key'));
 }