Test for Trac 58361

test-trac-58361.php

<?php
function custom_post_type_books() {
    $labels = array(
        'name'               => _x( 'Books', 'post type general name', 'your-text-domain' ),
        'singular_name'      => _x( 'Book', 'post type singular name', 'your-text-domain' ),
        'menu_name'          => _x( 'Books', 'admin menu', 'your-text-domain' ),
    );

    $args = array(
        'labels'             => $labels,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'menu_icon'          => 'none', // Set to 'none' to use CSS for the icon
    );

    register_post_type( 'books', $args );
}

add_action( 'init', 'custom_post_type_books' );