I have a Page like:

<?php 
/* 
    Template Name: Agenda
*/
get_header(); ?>
<div class="wrap">
    <div id="primary" class="content-area">
        <main id="main" class="site-main" role="main">
            My Hompagetext
        </main><!-- #main -->
    </div><!-- #primary -->
    <?php get_sidebar('test'); ?>
</div><!-- .wrap -->
<?php get_footer();?>

I have a sidebar called: sidebar-test.php

<aside id="secondary" class="widget-area" role="complementary" aria-label="<?php esc_attr_e( 'Test Sidebar', 'rczo2' ); ?>">
    this text is displayed on the bottom but I want it in the sidebar on the right side
</aside><!-- #secondary -->

I tryed reading across the WP-documentation and found how to register a widget, but not how to include a simple script like this.