WooCommerce Up-Sells Tab

remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15);
add_filter( 'woocommerce_product_tabs', 'accessories_tab');
function accessories_tab_content() {

global $product, $woocommerce, $woocommerce_loop;

$upsells = $product->get_upsells();

if ( sizeof( $upsells ) == 0 ) return;

$args = array(
    'post_type'           => 'product',
    'ignore_sticky_posts' => 1,
    'no_found_rows'       => 1,
    'posts_per_page'      => $posts_per_page,
    'orderby'             => $orderby,
    'post__in'            => $upsells,
    'post__not_in'        => array( $product->id ),
);

$products = new WP_Query( $args );

$woocommerce_loop['columns']    = $columns;

if ( $products->have_posts() ) : ?>

    <div class="upsells products">

        <h2><?php _e( 'You may also like&hellip;', 'woocommerce' ) ?></h2>

        <?php woocommerce_product_loop_start(); ?>

            <?php while ( $products->have_posts() ) : $products->the_post(); ?>

                <?php woocommerce_get_template_part( 'content', 'product' ); ?>

            <?php endwhile; // end of the loop. ?>

        <?php woocommerce_product_loop_end(); ?>

    </div>

<?php endif;

wp_reset_postdata();

}

function accessories_tab($tabs) {
 $tabs['test_tab'] = array(
 'title' => __( 'Accessories', 'woocommerce' ),
 'priority' => 50,
 'callback' => 'accessories_tab_content'
 );

 return $tabs;
}