How to extend visual composer with custom post as element

[admin]

I installed visual composer in my wordpress website. I need to add an custom post type as an element in visual composer and need to map the template file to the created custom post type element in visual composer.

<?php
add_action( 'vc_before_init', 'vc_extend_func' );
function vc_extend_func() {
   vc_map( array(
      "name" => __( "Testing", "my-text-domain" ),
      "base" => "test",
      "class" => "",
      "category" => __( "Content", "my-text-domain"),
   ) );
}
?>

This piece of code created the element in visual composer. My question is how to map a template to this element.

<?php
$dir = get_stylesheet_directory() . '/vc_templates';
vc_set_shortcodes_templates_dir( $dir );
?>

I also overwrite the default shortcode template path. But I didn't get the desired result. Kindly, provide solution to map the template for the created to post type.
Thanks in Advance.