Altax\Module\Task\Resource\RuntimeTask::getArgument PHP Method

    public function getArgument($index = 0, $default = null)
    {
        $retVal = null;
        if ($args = $this->getArguments()) {
            if (isset($args[$index])) {
                $retVal = $args[$index];
            } else {
                $retVal = $default;
            }
        } else {
            $retVal = $default;
        }
        return $retVal;
    }

 public function testGetArgument()
 {
     $runtimeTask = new RuntimeTask(null, $this->definedTask, $this->input, $this->output);
     $runtimeTask->getArgument(0);
 }