Theme test drive like plugin (wordpress)

theme-switch.php

<?php 
/*
Plugin Name: Theme drive
Description: Display different theme to user if logged in as admin
Author: Kyle Barber
*/
    add_filter('template', 'change_theme');
    add_filter('option_template', 'change_theme');
    add_filter('option_stylesheet', 'change_theme');
    function change_theme($theme) {
        if ( current_user_can('manage_options') ) {
            $theme = 'czechit-yo';
        }

        return $theme;
    }