WooCommerce - Add new product tab

functions.php

add_filter( 'woocommerce_product_tabs', 'woo_new_product_tab' );
function woo_new_product_tab( $tabs ) {
	
	// Adds the new tab
	
	$tabs['test_tab'] = array(
		'title' 	=> __( 'New Product Tab', 'woocommerce' ),
		'priority' 	=> 50,
		'callback' 	=> 'woo_new_product_tab_content'
	);

	return $tabs;

}
function woo_new_product_tab_content() {

	// The new tab content

	echo '<h2>New Product Tab</h2>';
	echo '<p>Here\'s your new product tab.</p>';
	
}

This Example of How to add html content in the new tab add this in the callback function

echo '<div class="options_group">';
woocommerce_wp_select( array(
    'id' => '_product_style',
    'label' => esc_html__( 'Product Style', 'theme_name' ),
    'options' => array(
        ''          => esc_html__( 'Default', 'theme_name' ),
        'style-1'   => esc_html__( 'Style 1', 'theme_name' ),
        'style-2'   => esc_html__( 'Style 2', 'theme_name' )
    ),
    'desc_tip' => true,
    'description' => esc_html__( 'Select product style to display on product page.', 'theme_name' )
) );
echo '</div>';
echo '<div class="options_group">';
woocommerce_wp_text_input( array(
    'id'                => 'driver',
    'label'             => esc_html__( 'Driver, 'theme_name' ),
    'desc_tip'          => true,
    'description'       => esc_html__( 'Set Driver', 'theme_name' )
) );
echo '</div>';

Another Useful Example:

class Woo_Product_Tabs{

	public static function init() {
		add_action( 'woocommerce_product_write_panel_tabs',array( 'Woo_Product_Tabs', 'add_product_delivery_panel_tab' ) );
		add_action( 'woocommerce_product_data_panels',array( 'Woo_Product_Tabs', 'add_product_delivery_panel_data' ) );
	}


	public static function add_product_delivery_panel_tab() {
		?>
        <li class="delivery_options delivery_tab">
            <a href="#delivery_product_data"><?php echo esc_html__( 'Delivery', 'theme_name' ); ?></a>
        </li>
		<?php
	}

	public static function add_product_delivery_panel_data() {
		global $post;
		?>
        <div id="delivery_product_data" class="panel woocommerce_options_panel">
            <div class="options_group">
				<?php
				$info = get_post_meta( $post->ID, 'info', true );
				wp_editor( htmlspecialchars_decode( $info ), 'info', array() );
				?>
            </div>
        </div>
		<?php
	}

}

Woo_Product_Tabs::init();