public function test_get_the_order_return_url()
 {
     $return_url = get_the_order_return_url(self::$order->get_id());
     $this->assertEquals($return_url, self::$order->get_return_url());
     $this->expectOutputString($return_url);
     the_order_return_url(self::$order->get_id());
 }
        <div class="shadowblock">
            <div class="post">
    
                <h1 class="single dotted"><?php 
_e('Order Summary', APP_TD);
?>
</h1>
    
                <div class="order-summary">
    
                    <?php 
the_order_summary();
?>
    
                    <form action="<?php 
the_order_return_url();
?>
" method="POST">
                        <p><?php 
_e('Please select a method for processing your payment:', APP_TD);
?>
</p>
                        <?php 
appthemes_list_gateway_dropdown();
?>
                        <button class="btn_orange" type="submit"><?php 
_e('Submit', APP_TD);
?>
</button>
                    </form>