<?php
// WP_Query arguments
$args = array(
    'post_type'      => 'testas123', // Set to your CPT
    'posts_per_page' => -1,          // -1 to retrieve all posts
);

// The Query
$query = new WP_Query($args);

// The Loop
if ($query->have_posts()) {
    echo '<ul>';
    while ($query->have_posts()) {
        $query->the_post();
        echo '<li><a href="' . get_permalink() . '">' . get_the_title() . '</a></li>';
    }
    echo '</ul>';
} else {
    // no posts found
    echo 'No posts found.';
}

// Restore original Post Data
wp_reset_postdata();
?>