PHP Test private, protected function

Test private, protected function

/**
     * Helper function to call protected method
     *
     * @param  stdObject $obj
     * @param  string    $methodName
     * @param  array[]   $args
     *
     * @return null
     */
    protected function callMethod($obj, $methodName, array $args) {
        $class = new \ReflectionClass($obj);
        $method = $class->getMethod($methodName);
        $method->setAccessible(true);

        return $method->invokeArgs($obj, $args);
    }