woocommerce/tests/legacy/unit-tests/rest-api/Helpers/ShippingHelper.php

<?php
/**
 * Shipping helper.
 */

namespace Automattic\WooCommerce\RestApi\UnitTests\Helpers;

defined( 'ABSPATH' ) || exit;

use \WC_Cache_Helper;
use \WC;

/**
 * Class ShippingHelper.
 */
class ShippingHelper {

	/**
	 * Create a simple flat rate at the cost of 10.
	 *
	 * @since 2.3
	 */
	public static function create_simple_flat_rate() {
		$flat_rate_settings = array(
			'enabled'      => 'yes',
			'title'        => 'Flat rate',
			'availability' => 'all',
			'countries'    => '',
			'tax_status'   => 'taxable',
			'cost'         => '10',
		);

		update_option( 'woocommerce_flat_rate_settings', $flat_rate_settings );
		update_option( 'woocommerce_flat_rate', array() );
		WC_Cache_Helper::get_transient_version( 'shipping', true );
		WC()->shipping()->load_shipping_methods();
	}

	/**
	 * Delete the simple flat rate.
	 *
	 * @since 2.3
	 */
	public static function delete_simple_flat_rate() {
		delete_option( 'woocommerce_flat_rate_settings' );
		delete_option( 'woocommerce_flat_rate' );
		WC_Cache_Helper::get_transient_version( 'shipping', true );
		WC()->shipping()->unregister_shipping_methods();
	}
}