Problem with wp_enqueue_script and footer

I am trying to enqueue a script from within a short code function:

function shortcode_mytest() {
   wp_enqueue_script('shortcode.mytest', PLUGIN_PATH.'js/mytest.js', null, null, true);

   echo 'test';
}
add_shortcode('mytest', shortcode_mytest);

The word “test” appears on the screen, but the script is never included at the footer of the page. I have checked my theme and it does call wp_footer() as required.

The only way that I can get this to work is to include the following line within my “functions.php” file:
add_action('wp_print_footer_scripts', 'wp_print_scripts');

To me this doesn’t seem right because surely if ‘wp_enqueue_script’ is designed to add to footer, then surely wouldn’t ‘wp_footer()’ automatically insert the enqueued scripts?

Any input would be greatly appreciated!

Kind regards,
Lea Hayes