Predis\Configuration\Options::getDefault PHP Метод

    public function getDefault($option)
    {
        if (isset($this->handlers[$option])) {
            $handler = $this->handlers[$option];
            $handler = new $handler();
            return $handler->getDefault($this);
        }
    }

 /**
  * @group disconnected
  */
 public function testReturnsNullAsDefaultValueForUndefinedOption()
 {
     $options = new Options();
     $this->assertNull($options->getDefault('unknown'));
 }